papers

Publications (80)

cond-mat.str-el2021

Topological surface conduction in Kondo insulator YbB

Y. Sato, Z. Xiang, Y. Kasahara +10

Kondo insulators have recently aroused great interest because they are promising materials that host a topological insulator state caused by the strong electron interactions. Moreo…

cond-mat.str-el2024

Magnetotransport of single crystal SmIrO across the pressure-induced quantum-critical phase boundary

M. J. Coak, K. Götze, T. Northam De La Fuente +6

Rare-earth pyrochlore iridates host two interlocking magnetic sublattices of corner-sharing tetrahedra and can harbour a unique combination of frustrated moments, exotic excitation…

cond-mat.str-el2001

The pressure dependence of electron-phonon coupling in the organic superconductor -(BEDT-TTF)Cu(SCN): A comparison of high pressure infrared reflectivity and Raman scattering experiments

R. D. McDonald, A. -K. Klehe, J. Singleton +1

We determine the pressure dependence of the electron-phonon coupling constant in -(BEDT-TTF)Cu(SCN) by comparison of high pressure Raman scattering and high pressur…

cond-mat.mtrl-sci2006

Separation of energy scales in the kagome antiferromagnet TmAgGe: a magnetic-field-orientation study up to 55 T

P. A. Goddard, J. Singleton, A. L. Lima-Sharma +4

TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization in…

cond-mat2001

Magneto-optics of organic crystalline field effect transistors

A. Ardavan, S. J. Blundell, J. Singleton

Organic molecular FETs provide an experimental framework for studying the band-filling dependent properties of two-dimensional metals. Here, we propose experiments to investigate t…

cond-mat.str-el2006

A photonic bandgap resonator to facilitate GHz frequency conductivity experiments in pulsed magnetic fields

R. D. McDonald, J. Singleton, P. A. Goddard +2

We describe instrumentation designed to perform millimeter-wave conductivity measurements in pulsed high magnetic fields at low temperatures. The main component of this system is a…

cond-mat.str-el2001

Thermal activation between Landau levels in the organic superconductor $β''$-(BEDT-TTF)SFCHCFSO

M. -S. Nam, A. Ardavan, J. A. Symington +6

We show that Shubnikov-de Haas oscillations in the interlayer resistivity of the organic superconductor $β''$-(BEDT-TTF)SF CHCFSO become very pronoun…

cond-mat.str-el2009

A new collective phenomenon arising from spin anisotropic perturbations to a Heisenberg square lattice manifested in paramagnetic resonance experiments

S. Cox, R. D. McDonald, J. Singleton +6

We report unexpected behaviour in a family of Cu spin- 1/2 systems, in which an apparent gap in the low energy magneto-optical absorption spectrum opens at low temperature. This pr…

cond-mat.supr-con2005

Recent high-magnetic-field studies of unusual groundstates in quasi-two-dimensional crystalline organic metals and superconductors

J. Singleton, N. Harrison, R. McDonald +5

After a brief introduction to crystalline organic superconductors and metals, we shall describe two recently-observed exotic phases that occur only in high magnetic fields. The fir…

cond-mat.str-el2003

Fermi-surface topology and the effects of intrinsic disorder in a class of charge-transfer salts containing magnetic ions, β''-(BEDT-TTF)_4[(H_3O)M(C_2O_4)_3]Y

A. I. Coldea, A. F. Bangura, J. Singleton +5

We report high-field magnetotransport measurements on β''-(BEDT-TTF)_4[(H_3O)M(C_2O_4)_3]Y, where M=Ga, Cr and Fe and Y=C_5H_5N. We observe similar Shubnikov-de Haas oscillations…

cond-mat.str-el2019

Unconventional thermal metallic state of charge-neutral fermions in an insulator

Y. Sato, Z. Xiang, Y. Kasahara +13

Quantum oscillations (QOs) in transport and thermodynamic parameters at high magnetic fields are an unambiguous signature of the Fermi surface, the defining characteristic of a met…

cond-mat.str-el2018

Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet -LiIrO

Sungkyun Choi, S. Manni, J. Singleton +7

The layered honeycomb iridate -LiIrO displays an incommensurate magnetic structure with counterrotating moments on nearest-neighbor sites, proposed to be stabilized by…

astro-ph2008

Mechanism of generation of the emission bands in the dynamic spectrum of the Crab pulsar

H. Ardavan, A. Ardavan, J. Singleton +1

We show that the proportionately spaced emission bands in the dynamic spectrum of the Crab pulsar (Hankins T. H. & Eilek J. A., 2007, ApJ, 670, 693) fit the oscillations of the squ…

cond-mat.str-el2004

Landau quantization effects in the charge-density-wave system (Per)(mnt) (where Au and Pt)

R. D. McDonald, N. Harrison, J. Singleton +4

A finite transfer integral orthogonal to the conducting chains of a highly one-dimensional metal gives rise to empty and filled bands that simulate an indirect-gap semiconduc…

cond-mat1995

Magnetotransport in a pseudomorphic GaAs/GaInAs/GaAlAs heterostructure with a Si delta-doping layer

M. van der Burgt, V. C. Karavolas, F. M. Peeters +6

Magnetotransport properties of a pseudomorphic GaAs/Ga0.8In0.2As/Ga0.75Al0.25As heterostructure are investigated in pulsed magnetic fields up to 50 T and at temperatures of T=1.4 K…

cond-mat.str-el2004

Absence of field-induced charge-density wave states in (Per)Pt(mnt)

R. D. McDonald, N. Harrison, P. Goddard +2

Graf {\it et al.} [Phys. Rev. Lett. {\bf 93} 076406 (2004)] recently attributed features in the magnetic-field-dependent longitudinal resistance of (Per)Pt(mnt) to a cascad…

cond-mat.str-el2015

Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn

L. Jiao, Y. Chen, Y. Kohama +15

Conventional, thermally-driven continuous phase transitions are described by universal critical behaviour that is independent of the specific microscopic details of a material. How…

cond-mat.str-el2019

Unconventional field-induced spin gap in an chiral staggered chain

J. Liu, S. Kittaka, R. D. Johnson +11

We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain [Cu(pym)(HO)]SiFHO (pym = pyrimidine). Electron-spin resonance,…

cond-mat.str-el2024

Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor EuSnAs

R. P. Day, K. Yamakawa, L. Pritchard Cairns +4

We report on the thermodynamic and transport properties of the rare-earth Zintl compound EuSnAs, which orders as a canted antiferromagnetic magnetic semiconductor at 10…

cond-mat.supr-con2008

Nearly Isotropic superconductivity in (Ba,K)Fe2As2

H. Q. Yuan, J. Singleton, F. F. Balakirev +4

Superconductivity was recently observed in the iron-arsenic-based compounds with a superconducting transition temperature (Tc) as high as 56K [1-7], naturally raising comparisons w…

cond-mat.str-el2013

Multiple quantum phase transitions in a heavy fermion antiferromagnet

L. Jiao, H. Q. Yuan, Y. Kohama +12

We report measurements of magnetic quantum oscillations and specific heat at low temperatures across a field-induced antiferromagnetic quantum critical point (QCP)(B_{c0}\approx50T…

cond-mat.str-el2007

Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits

A. F. Bangura, P. A. Goddard, J. Singleton +6

We present experimental evidence for a hitherto unconfirmed type of angle-dependent magnetoresistance oscillation caused by magnetic breakdown. The effect was observed in the organ…

cond-mat.str-el2024

Pseudo-easy-axis anisotropy in antiferromagnetic diamond-lattice systems Ni(pym)

S. Vaidya, A. Hernández-Melián, J. P. Tidey +12

We investigate the magnetic properties of antiferromagnetic diamond lattice, Ni(pyrimidine) ( = Cl, Br), hosting a single-ion anisotropy (SIA) orientation whi…

cond-mat.str-el2003

Experimental electronic heat capacities of and Plutonium; heavy-fermion physics in an element

J. C. Lashley, J. Singleton, A. Migliori +4

We have measured the heat capacities of PuAl and Pu over the temperature range 2-303 K. The availability of data below 10 K plus an estimate of the phon…

cond-mat.str-el2013

Controlling magnetic order and quantum disorder in one- and zero-dimensional molecule-based magnets

T. Lancaster, P. A. Goddard, S. J. Blundell +19

We investigate the structural and magnetic properties of two molecule-based magnets synthesized from the same starting components. Their different structural motifs promote contras…

cond-mat.supr-con2016

The magnetic phase diagram of underdoped YBa2Cu3Oy inferred from torque magnetization and thermal conductivity

Fan Yu, Max Hirschberger, Toshinao Loew +11

Strong evidence for charge-density correlation in the underdoped phase of the cuprate YBa2Cu3Oy was obtained by nuclear magnetic resonance (NMR) and resonant x-ray scatter- ing. Th…

cond-mat.str-el2002

The pressure dependence of many-body interactions in the organic superconductor -(BEDT-TTF)Cu(SCN): A comparison of high pressure infrared reflectivity and Raman scattering experiments

R. D. McDonald, A. -K. Klehe, J. Singleton +1

We determine the pressure dependence of the electron-phonon coupling in -(BEDT-TTF)Cu(SCN) by comparison of high pressure Raman scattering and high pressure infrare…

physics.optics2006

Comment on "Radial dependence of radiation from a bounded source" by Kirk T. McDonald

A. Ardavan, H. Ardavan, J. Singleton

The purpose of this note is to point out that McDonald's criticism of our work \cite{r1} is based on a circular argument. In order to show that the field of a bounded source falls…

cond-mat.str-el2003

A new quantum fluid at high magnetic fields in the marginal charge-density-wave system -(BEDT-TTF)Hg(SCN) (where ~K and Rb)

N. Harrison, J. Singleton, A. Bangura +4

Single crystals of the organic charge-transfer salts -(BEDT-TTF)Hg(SCN) have been studied using Hall-potential measurements (K) and magnetization experiments (

cond-mat.str-el2022

Pseudogap in elemental plutonium

M. Wartenbe, P. H. Tobash, J. Singleton +3

Electronic correlations associated with incipient magnetism have long been recognized as an important factor in stabilizing the largest atomic volume phase of plutonium, yet t…

cond-mat.str-el2004

Suppression of the structural phase transition in by large magnetic fields

F. Drymiotis, J. Singleton, N. Harrison +7

The transition in CeLaTh is measured as a function of applied magnetic field using both resistivity and magnetization. The transition tempe…

cond-mat.str-el2025

Single-ion anisotropy driven chiral magnetic order in a spin-1 antiferromagnetic chain

S. Vaidya, S. P. M. Curley, P. Manuel +17

Chirality in magnetic systems gives rise to a wide range of exotic phenomena, yet its influence in chains remains largely unexplored. Here, we present a comprehensive experim…

cond-mat.supr-con2011

Evidence of nodal gap structure in the non-centrosymmetric superconductor Y2C3

J. Chen, M. B. Salamon, S. Akutagawa +3

The magnetic penetration depth and the upper critical field of the non-centrosymmetric (NCS) superconductor YC have been measured using…

cond-mat.supr-con2009

Weak anisotropy of the superconducting upper critical field in Fe1.11Te0.6Se0.4 single crystals

M. H. Fang, J. H. Yang, F. F. Balakirev +6

We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se0.4 using pulsed magnetic fields of up to 60T. A rather high zero-t…

cond-mat.other2025

Reentrant Landau Levels in a Dirac topological insulator

C. Kaufmann Ribeiro, J. C. Mutch, Q. Jiang +13

The quantum limit, where magnetic fields confine carriers to the lowest Landau level, is predicted to host exotic quantum phases arising from strengthened electronic correlations,…

astro-ph2007

Occurrence of concurrent `orthogonal' polarization modes in the Lienard-Wichert field of a rotating superluminal source

A. Schmidt, H. Ardavan, J. Fasel +2

We evaluate the Lienard-Wiechert field of a rotating superluminal point source numerically and show that this radiation field has the following intrinsic characteristics. (i) It is…

cond-mat.str-el2006

Orbitally quantized density-wave states perturbed from equilibrium

N. Harrison, R. D. McDonald, J. Singleton

We consider the effect that a change in the magnetic induction B has in causing an orbitally quantized field-induced spin- or charge density wave (FISDW or FICDW) state to depart f…

cond-mat1994

Temperature Induced Transitions between Insulator, Metal, and Quantum Hall States

S. V. Kravchenko, Whitney Mason, J. E. Furneaux +3

We report the observation of TEMPERATURE-INDUCED transitions between insulator, metal, and quantum-Hall behaviors for transport coefficients in the very dilute high mobility two-di…

cond-mat.str-el2019

Enhancement of the effective mass at high magnetic fields in CeRhIn

L. Jiao, M. Smidman, Y. Kohama +14

The Kondo-lattice compound CeRhIn displays a field-induced Fermi surface reconstruction at T, which occurs within the antiferromagnetic state, prior to the quant…

cond-mat.str-el2006

High-field magnetoresistive effects in reduced-dimensionality organic metals and superconductors

J. Singleton, R. D. McDonald, N. Harrison

The large charge-transfer anisotropy of quasi-one- and quasi-two-dimensional crystalline organic metals means that magnetoresistance is one of the most powerful tools for probing t…

cond-mat.mtrl-sci2005

Fermi Surface as a Driver for the Shape-Memory Effect in AuZn

R. D. McDonald, J. C. Lashley, J. Singleton +7

Martensites are materials that undergo diffusionless, solid-state transitions. The martensitic transition yields properties that depend on the history of the material and may allow…

cond-mat.supr-con2001

A statistical model for the intrinsically broad superconducting to normal transition in quasi-two-dimensional crystalline organic metals

J. Singleton, N. Harrison, C. H. Mielke +2

Although quasi-two-dimensional organic superconductors such as -(BEDT-TTF)Cu(NCS) seem to be very clean systems, with apparent quasiparticle mean-free paths of several…

cond-mat.mtrl-sci2016

Electric polarization observed in single crystals of multiferroic Lu2MnCoO6

S. Chikara, J. Singleton, J. Bowlan +5

We report electric polarization and magnetization measurements in single crystals of double perovskite Lu2MnCoO6 using pulsed magnetic fields and optical second harmonic generation…

cond-mat.supr-con2001

Experimental observation of Frohlich superconductivity in high magnetic fields

N. Harrison, C. H. Mielke, J. Singleton +2

Resistivity and irreversible magnetisation data taken within the high-magnetic-field CDWx phase of the quasi-two-dimensional organic metal alpha-(BEDT-TTF)2KHg(SCN)4 are shown to b…

physics.optics2004

Experimental demonstration of a new radiation mechanism: emission by an oscillating, accelerated, superluminal polarization current

A. Ardavan, J. Singleton, H. Ardavan +3

We describe the experimental implementation of a superluminal ({\it i.e.} faster than light {\it in vacuo}) polarization current distribution that both oscillates and undergoes cen…

physics.optics2003

The spectral and polarization characteristics of the nonspherically decaying radiation generated by polarization currents with superluminally rotating distribution patterns

H. Ardavan, A. Ardavan, J. Singleton

We present a theoretical study of the emission from a superluminal polarization current whose distribution pattern rotates (with an angular frequency ) and oscillates (with a f…

cond-mat.supr-con2011

Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2

H. Q. Yuan, L. Jiao, F. F. Balakirev +9

Variant approaches, either based on the Fermi surface nesting or started from the proximity to a Mott-insulator, were proposed to elucidate the physics in iron pnictides, but no co…

cond-mat.str-el2007

Sliding charge density wave in manganites

Susan Cox, J. Singleton, R. D. McDonald +2

The so-called stripe phase of the manganites is an important example of the complex behaviour of metal oxides, and has long been interpreted as the localisation of charge at atomic…

cond-mat.str-el2024

Magnetic properties of a staggered chain Ni(pym)(HO)(NO) with an alternating single-ion anisotropy direction

S. Vaidya, S. P. M. Curley, P. Manuel +13

Materials composed of spin-1 antiferromagnetic (AFM) chains are known to adopt complex ground states which are sensitive to the single-ion-anisotropy (SIA) energy (), and intrac…

cond-mat.str-el2019

Unusual phase boundary of the magnetic-field-tuned valence transition in CeOsSb

K. Götze, M. J. Pearce, P. A. Goddard +8

The phase diagram of the filled skutterudite CeOsSb has been mapped in fields of up to 60 T and temperatures down to 0.5 K using resistivity, magnetostriction, a…

cond-mat.str-el2001

Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor -(BEDT-TTF)Cu(NCS)

J. Singleton, J. A. Symington, M. -S. Nam +3

Single crystals of the layered organic type II superconductor, -(BEDT-TTF)Cu(NCS), have been studied in magnetic fields of up to 33 T and at temperatures between 0.…

cond-mat.str-el2021

Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange

F. Xiao, W. J. A. Blackmore, B. M. Huddart +13

We present an investigation of the effect of randomizing exchange strengths in the square lattice quasi-two-dimensional quantum Heisenberg antiferromagnet (QuinH)Cu(Cl$…

cond-mat.supr-con2008

Superconducting properties of Fe-based layered superconductor LaOFFeAs

G. F. Chen, Z. Li, G. Li +10

We have employed a new route to synthesize single phase F-doped LaOFeAs compound and confirmed the superconductivity above 20 K in this Fe-based system. We show that the new superc…

cond-mat.mtrl-sci2003

Non-adiabatic small polaron hopping in the n=3 Ruddlesden-Popper compound Ca4Mn3O10

J. Lago, P. D. Battle, M. J. Rosseinsky +2

Magnetotransport properties of the compound Ca4Mn3O10 are interpreted in terms of activated hopping of small magnetic polarons in the non-adiabatic regime. Polarons are most likely…

cond-mat.str-el2008

Isotope effect in quasi-two-dimensional metal-organic antiferromagnets

P. A. Goddard, J. Singleton, C. Maitland +9

Although the isotope effect in superconducting materials is well-documented, changes in the magnetic properties of antiferromagnets due to isotopic substitution are seldom discusse…

cond-mat.supr-con2019

Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFeAs

M. P. Smylie, A. E. Koshelev, K. Willa +12

We present a study of the upper critical field, H, of pristine and proton-irradiated RbEuFeAs crystals in pulsed magnetic fields of up to 65 T. The data for H

cond-mat.str-el2003

Angle Dependent Magnetoresistance of the Layered Organic Superconductor κ-(ET)2Cu(NCS)2: Simulation and Experiment

P. A. Goddard, S. J. Blundell, J. Singleton +6

The angle-dependences of the magnetoresistance of two different isotopic substitutions (deuterated and undeuterated) of the layered organic superconductor κ-(ET)2Cu(NCS)2 are pres…

physics.optics2002

The frequency spectrum of focused broadband pulses of electromagnetic radiation generated by polarization currents with superluminally rotating distribution patterns

H. Ardavan, A. Ardavan, J. Singleton

We investigate the spectral features of the emission from a superluminal polarization current whose distribution pattern rotates with an angular frequency and oscillates with…

cond-mat.str-el2008

Exchange parameters of copper-based quasi-two-dimensional Heisenberg magnets measured using high magnetic fields and muon-spin rotation

P. A. Goddard, J. Singleton, P. Sengupta +9

Pulsed-field magnetization experiments (fields of up to 85 T and temperatures down to 0.4 K) are reported on nine organic Cu-based two-dimensional (2D) Heisenberg magnets.…

cond-mat.str-el2005

Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn

P. A Goddard, J. Singleton, R. D. McDonald +4

AuZn undergoes a shape-memory transition at 67 K. The de Haas van Alphen effect persists to 100 K enabling the observation of a change in the quantum oscillation spectrum indicativ…

cond-mat.str-el2020

Extremely well isolated 2D spin- antiferromagnetic Heisenberg layers with small exchange coupling in the molecular-based magnet CuPOF

D. Opherden, N. Nizar, K. Richardson +23

We report on a comprehensive characterization of the newly synthesized Cu-based molecular magnet [Cu(pz)(2-HOpy)](PF) (CuPOF), where pz = CHN and…

cond-mat.str-el2007

A de Haas-van Alphen study of the filled skutterudite compounds PrOsAs and LaOsAs

Pei-Chun Ho, J. Singleton, M. B. Maple +4

Comprehensive magnetic-field-orientation dependent studies of the susceptibility and de Haas-van Alphen effect have been carried out on single crystals of the filled skutterudites…

cond-mat.str-el2006

Dirty Peierls transition to stripe phase in manganites

S. Cox, J. C. Lashley, E. Rosten +3

The nature of the phase transitions in LaCaMnO and PrCaMnO has been probed using heat capacity and magnetisation measurements. The phase trans…

cond-mat.supr-con2020

Observation of cyclotron resonance and measurement of the hole mass in optimally-doped LaSrCuO

K. W. Post, A. Legros, D. G. Rickel +8

Using time-domain terahertz spectroscopy in pulsed magnetic fields up to 31 T, we measure the terahertz optical conductivity in an optimally-doped thin film of the high temperature…

cond-mat.str-el2001

Cyclotron resonance harmonics in the organic superconductor $β^{\prime\prime}$-(BEDT-TTF)SFCHCFSO; observation of a new kind of effective mass renormalization

R. S. Edwards, J. A. Symington, A. Ardavan +5

Cyclotron resonance, along with its second and third harmonics, has been observed in the quasi-two-dimensional organic superconductor $β^{\prime\prime}$-(BEDT-TTF)SFCH

cond-mat.str-el2015

The monoclinic crystal structure of -RuCl and the zigzag antiferromagnetic ground state

R. D. Johnson, S. Williams, A. A. Haghighirad +8

The layered honeycomb magnet alpha-RuCl3 has been proposed as a candidate to realize a Kitaev spin model with strongly frustrated, bond-dependent, anisotropic interactions between…

cond-mat.supr-con2008

Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8

E. A. Yelland, J. Singleton, C. H. Mielke +4

We report the observation of quantum oscillations in the underdoped cuprate superconductor YBa2Cu4O8 using a tunnel-diode oscillator technique in pulsed magnetic fields up to 85T.…

cond-mat.mtrl-sci2011

Multiferroic behavior in the new double-perovskite LuMnCoO

S. Yanez-Vilar, E. D. Mun, V. S. Zapf +9

We present a new member of the multiferroic oxides, LuMnCoO, which we have investigated using X-ray diffraction, neutron diffraction, specific heat, magnetization, electric…

cond-mat.str-el2005

Origin of Rapid Oscillations in Low Dimensional (TMTSF)2PF6

A. V. Kornilov, V. M. Pudalov, A. -K. Klehe +3

In order to clarify the origin of the "Rapid Oscillation" (RO) in (TMTSF)2PF6, we studied the magnetoresistance anisotropy in the Field Induced Spin Density Wave (FISDW) phase. We…

cond-mat.str-el2002

Comparison of the Fermi-surface topologies of kappa-(BEDT-TTF)_2 Cu(NCS)_2 and its deuterated analogue

R. S. Edwards, A. Narduzzo, J. Singleton +2

We have measured details of the quasi one-dimensional Fermi-surface sections in the organic superconductor kappa-(BEDT-TTF)_2 Cu(NCS)_2 and its deuterated analogue using angle-depe…

cond-mat.str-el2003

Charge-density Waves Survive the Pauli Paramagnetic Limit

R. McDonald, N. Harrison, L. Balicas +3

Measurements of the resistance of single crystals of (Per)Au(mnt) have been made at magnetic fields of up to 45 T, exceeding the Pauli paramagnetic limit of $B_{\rm P}\…

cond-mat.str-el2017

Adiabatic physics of an exchange-coupled spin-dimer system: magnetocaloric effect, zero-point fluctuations, and possible two-dimensional universal behavior

J. Brambleby, P. A. Goddard, J. Singleton +9

We present the magnetic and thermal properties of the bosonic-superfluid phase in a spin-dimer network using both quasistatic and rapidly-changing pulsed magnetic fields. The entro…

cond-mat.str-el2015

Magnetism in a family of square lattice antiferromagnets Ni(pyz) ( Cl, Br, I, NCS; pyz = pyrazine)

J. Liu, P. A. Goddard, J. Singleton +23

The crystal structures of Ni(pyz) ( = Cl (\textbf{1}), Br (\textbf{2}), I (\textbf{3}) and NCS (\textbf{4})) were determined at 298~K by synchrotron X-ray powder diffra…

cond-mat.str-el2015

The magnetic ground state of two isostructual polymeric quantum magnets, [Cu(HF)(pyrazine)]SbF and [Co(HF)(pyrazine)]SbF, investigated with neutron powder diffraction

J. Brambleby, P. A. Goddard, R. D. Johnson +14

The magnetic ground state of two isostructural coordination polymers (i) the quasi two-dimensional S = 1/2 square-lattice antiferromagnet [Cu(HF)(pyrazine)]SbF; a…

cond-mat.str-el2007

Very weak electron-phonon coupling and strong strain coupling in manganites

S. Cox, J. C. Loudon, A. J. Williams +4

The coupling of the manganite stripe phase to the lattice and to strain has been investigated via transmission electron microscopy studies of polycrystalline and thin film manganit…

cond-mat.supr-con2011

The magnetoresistance and Hall effect in CeFeAsO: a high magnetic field study

H. Q. Yuan, L. Jiao, J. Singleton +4

The longitudinal electrical resistivity and the transverse Hall resistivity of CeFeAsO are simultaneously measured up to a magnetic field of 45T using the facilities of pulsed magn…

cond-mat.str-el2006

Dirty Peierls transitions in alpha-Uranium

S. Cox, E. Rosten, R. D. McDonald +1

We point out that a recent model for the heat capacity of alpha-U that invokes CDW collective modes is unphysical. We show instead that the features in the heat capacity of both si…

cond-mat.supr-con2011

Large upper critical field in non-centrosymmetric superconductor Y2C3

H. Q. Yuan, J. Chen, J. Singleton +2

We determine the upper critical field of non-centrosymmetric superconductor using two distinct methods: the bulk magnetization M(T) and the tunnel-diod…

cond-mat.str-el2021

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOsSb

K. Götze, M. J. Pearce, M. J. Coak +9

CeOsSb, a member of the skutterudite family, has an unusual semimetallic low-temperature -phase that inhabits a wedge-like area of the field - temperature $…

astro-ph.GA2009

Comparison of multiwavelength observations of 9 broad-band pulsars with the spectrum of the emission from an extended current with a superluminally rotating distribution pattern

H. Ardavan, A. Ardavan, J. Singleton +7

The observed spectra of 9 pulsars for which multiwavelength data are available from radio to - or -ray bands (Crab, Vela, Geminga, B0656+14, B1055-52, B1509-58, B1706-44, B1…