Publications (67)
Low-dimensional quantum magnetism in Cu(NCS): A molecular framework material
Matthew J. Cliffe, Jeongjae Lee, Joseph A. M. Paddison +7
Low-dimensional magnetic materials with spin- moments can host a range of exotic magnetic phenomena due to the intrinsic importance of quantum fluctuations to their be…
Emergent helical texture of electric dipoles
Dmitry D. Khalyavin, Roger D. Johnson, Fabio Orlandi +3
Long-range ordering of magnetic dipoles in bulk materials gives rise to a broad range of magnetic structures, from simple collinear ferromagnets and antiferromagnets, to complex ma…
Magnetic field induced quantum spin liquid in the two coupled trillium lattices of KNi(SO)
Ivica Zivkovic, Virgile Favre, Catalina Salazar Mejia +19
Quantum spin liquids are exotic states of matter which form when strongly frustrated magnetic interactions induce a highly entangled quantum paramagnet far below the energy scale o…
Spin dynamics in the S =1/2 kagome compound vesignieite, Cu3Ba(VO5H)2
Ross H Colman, Fabrice Bert, David Boldrin +5
We report the study of high quality samples of the frustrated S = 1/2 kagome antiferromagnet vesignieite, Cu3Ba(VO5H)2. Neutron powder diffraction measurements evidence the high qu…
Understanding the evolution of the magnetic ground state in BaNaRuO
Shruti Chakravarty, Pascal Manuel, Antonio Cervellino +1
We report a comprehensive investigation of the quadruple perovskite BaNaRuO, in which we discover a robust spin-lattice coupled ground state characterized by a long-…
Creating and controlling Dirac fermions, Weyl fermions, and nodal lines in the magnetic antiperovskite EuPbO
Moritz M. Hirschmann, Alexandra S. Gibbs, Fabio Orlandi +8
The band topology of magnetic semimetals is of interest both from the fundamental science point of view and with respect to potential spintronics and memory applications. Unfortuna…
Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δ
Lei Ding, Fabio Orlandi, Dmitry D. Khalyavin +4
We present a study of the magnetic-field effect on spin correlations in the charge ordered triangular Ising system LuFe2O4+δ through single crystal neutron diffraction. In the abs…
Magnetic State Selected by Magnetic Dipole Interaction in Kagome Antiferromagnet NaBaMnF
Shohei Hayashida, Hajime Ishikawa, Yoshihiko Okamoto +7
We have studied the ground state of the classical Kagome antiferromagnet NaBaMnF. Strong magnetic Bragg peaks observed in the -spacing shorter than 6.0 Ã were…
Structural, Magnetic, and Superconducting Properties of Ba1-xNaxFe2As2
Sevda Avci, Jared M. Allred, Omar Chmaissem +11
We report the results of a systematic investigation of the phase diagram of the iron-based superconductor system, Ba1-xNaxFe2As2, from x = 0.1 to x = 1.0 using high resolution neut…
Neutron diffraction and symmetry analysis of the martensitic transformation in Co-doped NiMnGa
Fabio Orlandi, Aslı Ãakır, Pascal Manuel +3
Martensitic transformations are strain driven displacive transitions governing the mechanical and physical properties in intermetallic materials. This is the case in NiMnGa, wh…
Uniaxial-Stress-Induced Magnetic Transitions in the Triangular-Lattice Antiferromagnet PdCrO2
Nina Stilkerich, Tobias Ritschel, Hilary M. L. Noad +10
Uniaxial stress is a promising method to tune magnetic frustration, allowing its effects to be studied in a precise way. In this work, uniaxial stress is applied to the triangular-…
Tetragonal magnetic phase in BaKFeAs from x-ray and neutron diffraction
Jared M. Allred, Sevda Avci, Duck Young Chung +8
Combined neutron and x-ray diffraction experiments demonstrate the formation of a low-temperature minority tetragonal phase in BaKFeAs in addition to the…
Fragmented spin ice and multi- ordering in rare-earth antiperovskites
Attila Szabó, Fabio Orlandi, Pascal Manuel
We study near-neighbour and dipolar Ising models on a lattice of corner-sharing octahedra. In an extended parameter range of both models, frustration between antiferromagnetism and…
Tunable Weyl and Dirac states in the nonsymmorphic compound
Leslie M. Schoop, Andreas Topp, Judith Lippmann +14
Recent interest in topological semimetals has lead to the proposal of many new topological phases that can be realized in real materials. Next to Dirac and Weyl systems, these incl…
Magnetic ordering in pressure-induced phases with giant spin-driven ferroelectricity in multiferroic TbMnO3
Noriki Terada, Dmitry D. Khalyavin, Pascal Manuel +3
In order to clarify the mechanism associated with pressure/magnetic-field-induced giant ferroelectric polarization in TbMnO3, this work investigated changes in magnetic ordering br…
Strong quantum fluctuations due to competition between magnetic phases in a pyrochlore iridate
Henrik Jacobsen, Cameron D. Dashwood, Elsa Lhotel +6
We report neutron diffraction measurements of the magnetic structures in two pyrochlore iridates, Yb2Ir2O7 and Lu2Ir2O7. Both samples exhibit the all-in-all-out magnetic structure…
Colossal magnetoresistance in the insulating ferromagnetic double perovskites TlNiMnO: A neutron diffraction study
Lei Ding, Dmitry D. Khalyavin, Pascal Manuel +4
In the family of double perovskites, colossal magnetoresistance (CMR) has been so far observed only in half-metallic ferrimagnets such as the known case SrFeMoO where it ha…
Complex spin dynamics induced metamagnetic phase transitions in Dirac semimetal EuAuBi
Lipika, Shobha Singh, Anyesh Saraswati +8
We report a comprehensive investigation of the physical properties of the Dirac semimetal compound EuAuBi single crystals, using neutron diffraction, magnetization, electrical tran…
Discovery of Superconductivity in (Ba,K)SbO
Minu Kim, Graham M. McNally, Hun-Ho Kim +12
Superconducting bismuthates (Ba,K)BiO (BKBO) constitute an interesting class of superconductors in that superconductivity with a remarkably high of 30 K arises…
Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2
Dan Sun, Dmitry Sokolov, Jack Bartlett +8
In the triangular layered magnet PdCrO2 the intralayer magnetic interactions are strong, however the lattice structure frustrates interlayer interactions. In spite of this, long-ra…
Nature of Partial Magnetic Order in the Frustrated Antiferromagnet Gd2Ti2O7
Joseph A. M. Paddison, Andrew B. Cairns, Dmitry D. Khalyavin +8
The frustrated pyrochlore antiferromagnet GdTiO has an unusual partially-ordered magnetic structure at the lowest measurable temperatures. This structure is curre…
Fluctuation-driven topological Hall effect in room-temperature itinerant helimagnet Fe3Ga4
Priya R. Baral, Victor Ukleev, Ivica ŽivkoviÄ +12
The topological Hall effect (THE) is a hallmark of a non-trivial geometric spin arrangement in a magnetic metal, originating from a finite scalar spin chirality (SSC). The associat…
Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets
William J. A. Blackmore, Jamie Brambleby, Tom Lancaster +18
Although low-dimensional antiferromagnets remain of great interest, difficulty in obtaining high-quality single crystals of the newest materials hinders experimental resear…
Magnetic ordering and ferroelectricity in multiferroic 2H-AgFeO2: Comparison between hexagonal and rhombohedral polytypes
Noriki Terada, Dmitry D. Khalyavin, Pascal Manuel +2
Magnetic and dielectric properties of the hexagonal triangular lattice antiferromagnet 2H-AgFeO2 have been studied by neutron diffraction, magnetic susceptibility, specific heat, p…
Compass-model physics on the hyperhoneycomb lattice in the extreme spin-orbit regime
Ryutaro Okuma, Kylie MacFarquharson, Roger D. Johnson +3
The physics of spin-orbit entangled magnetic moments of and transition metal ions on a honeycomb lattice has been much explored in search for unconventional magnetic orde…
Probing the Manipulation of Antiferromagnetic Order in CuMnAs Films Using Neutron Diffraction
Stuart F. Poole, Luke X. Barton, Mu Wang +7
We describe measurements of the uniaxial magnetic anisotropy and spin-flop rotation of the Néel vector in antiferromagnetic CuMnAs thin films using neutron diffraction. The suppre…
Heisenberg spins on an anisotropic triangular lattice: PdCrO2 under uniaxial stress
Dan Sun, Dmitry A. Sokolov, Richard Waite +6
When Heisenberg spins interact antiferromagnetically on a triangular lattice and nearest-neighbor interactions dominate, the ground state is 120 antiferromagnetism. In th…
Biaxial Strain Control of Helimagnetism via Chemical Expansion in Thin Film SrFeO3
Jennifer Fowlie, Jiarui Li, Danilo Puggioni +15
We demonstrate control of helimagnetic order in biaxially strained SrFeO3 thin films using neutron diffraction and resonant soft x-ray scattering. SrFeO3, a negative charge-transfe…
Magnetic states of the Kondo lattice CePdSi and their pressure evolution
Yanan Zhang, Zhaoyang Shan, Jiawen Zhang +11
Frustrated Kondo lattices are ideal platforms for exploring unconventional forms of quantum criticality, as well as magnetism and other emergent phases. Here we report the magnetic…
A ferroelectric-like structural transition in a metal
Youguo Shi, Yanfeng Guo, Xia Wang +13
Metals cannot exhibit ferroelectricity because static internal electric fields are screened by conduction electrons, but in 1965, Anderson and Blount predicted the possibility of a…
Robust triple-q magnetic order with trainable spin vorticity in NaCoTeO
Xianghong Jin, Mengqiao Geng, Fabio Orlandi +4
Recent studies suggest that the candidate Kitaev magnet NaCoTeO possesses novel triple- magnetic order instead of conventional single- zigzag or…
One-dimensional conduction channels in the correlated Mott NiS2 arising from obstructed Wannier charges
Mikel Iraola, Haojie Guo, Fabio Orlandi +9
NiS2, a compound characterized by its pyrite structure, uniquely bridges the realms of strong correlation physics and topology. While bulk NiS2 is known to be a Mott or charge-tran…
Magnetic and electronic ordering phenomena in the [RuO] honeycomb lattice compound AgRuO
Walter Schnelle, Beluvalli E. Prasad, Claudia Felser +13
The silver ruthenium oxide AgRuO consists of honeycomb [RuO] layers, and can be considered an analogue of SrRuO with a different intercalation stage.…
Absence of magnetic order in RuO: insights from SR spectroscopy and neutron diffraction
Philipp KeÃler, Laura Garcia-Gassull, Andreas Suter +8
Altermagnets are a novel class of magnetic materials besides ferro- and antiferromagnets, where the interplay of lattice and spin symmetries produces a magnetic order that is stagg…
Evolution of the structural, magnetic and electronic properties of the triple perovskite BaCoIrO
Charu Garg, Deepak Roy, Martin Lonsky +5
We report a comprehensive investigation of the triple perovskite iridate BaCoIrO. Stabilizing in the hexagonal symmetry at room temperature, this sys…
Strengthening the magnetic interactions in pseudobinary first-row transition metal thiocyanates, (NCS)
Euan N. Bassey, Joseph A. M. Paddison, Evan N. Keyzer +6
Understanding the effect of chemical composition on the strength of magnetic interactions is key to the design of magnets with stronger exchange interactions. The magnetic divalent…
Structural and magnetic characterisation of iron oxyselenides Ce2O2Fe2OSe2 and Nd2O2Fe2OSe2
Emma E. McCabe, Andrew S. Wills, Laurent Chapon +2
We present here an investigation of the magnetic ordering in the Mott insulating oxyselenide materials Ln2O2Fe2OSe2 (Ln = Ce, Nd). Neutron powder diffraction data are consistent wi…
Incommensurate atomic and magnetic modulations in the spin-frustrated β-NaMnO2 triangular lattice
Fabio Orlandi, Eleni Aza, Ioanna Bakaimi +9
The layered β-NaMnO2, a promising Na-ion energy-storage material has been investigated for its triangular lattice capability to promote complex magnetic configurations that may re…
Direct imaging and control of Berry curvature in noncollinear antiferromagnetic single-crystal thin films
Yuchuan Yao, Pratap Pal, Camron Farhang +11
The discovery of the intrinsic anomalous Hall effect (AHE) in noncollinear antiferromagnets where transverse Hall voltage emerges without magnetic field, has opened a plethora of p…
Unusual magnetic structure of high-pressure synthesized perovskites ACrO3(A=Sc, In, Tl)
Lei Ding, Pascal Manuel, Dmitry D. Khalyavin +5
Magnetic structures of metastable perovskites ScCrO3, InCrO3 and TlCrO3, stabilized under high-pressure and high-temperature conditions, have been studied by neutron powder diffrac…
Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO
Lei Ding, Pascal Manuel, Sebastian Bachus +8
We present the structural characterization and low-temperature magnetism of the triangular-lattice delafossite NaYbO. Synchrotron x-ray diffraction and neutron scattering exclu…
Rich magnetoelectric phase diagrams of multiferroic single-crystal alpha-NaFeO2
Noriki Terada, Yuta Ikedo, Hirohiko Sato +6
The magnetic and dielectric properties of the multiferroic triangular lattice magnet compound alpha-NaFeO2 were studied by magnetization, specific heat, dielectric permittivity, an…
β-Mn: Emergent Simplicity in a Complex Structure
Joseph A. M. Paddison, J. Ross Stewart, Pascal Manuel +4
We investigate low-temperature spin correlations in the metallic frustrated magnet β-MnCo. Single-crystal polarised-neutron scattering experiments reveal the persistence of highly…
Evidence for Conical Magnetic Structure in M-type BaFe12O19 Hexaferrite: A Combined Single-Crystal XMCD and Neutron Diffraction Study
Keshav Kumar, Shrawan K. Mishra, Sanjay Singh +5
The magnetic ground state of BaFe12O19 (BFO) was investigated using X-ray absorption at 1.2 K and 1.5 K, respectively. The XMCD measurements on single-crystals of BFO in grazing in…
Combining micro- and macroscopic probes to untangle single-ion and spatial exchange anisotropies in a quantum antiferromagnet
Jamie Brambleby, Jamie L. Manson, Paul A. Goddard +14
The magnetic ground state of the quasi-one-dimensional spin-1 antiferromagnetic chain is sensitive to the relative sizes of the single-ion anisotropy () and the intrachain ()…
Kitaev Interactions Through an Extended Superexchange Pathway in the jeff = 1/2 Ru3+ Honeycomb Magnet, RuP3SiO11
Aly H. Abdeldaim, Hlynur Gretarsson, Sarah J. Day +7
Magnetic materials are composed of the simple building blocks of magnetic moments on a crystal lattice that interact via magnetic exchange. Yet from this simplicity emerges a remar…
Ferrimagnetic 120 magnetic structure in Cu2OSO4
Virgile Yves Favre, Gregory S. Tucker, Clemens Ritter +10
We report magnetic properties of a 3d (Cu) magnetic insulator Cu2OSO4 measured on both powder and single crystal. The magnetic atoms of this compound form layers, whose…
Charge density wave-templated spin cycloid in topological semimetal
Tyger H. Salters, Fabio Orlandi, Tanya Berry +4
Magnetic topological semimetals present open questions regarding the interplay of crystal symmetry, magnetism, band topology, and electron correlations. (Ln=…
Unravelling the complex magnetic structure of multiferroic pyroxene NaFeGe2O6: A combined experimental and theoretical study
Lei Ding, Pascal Manuel, Dmitry D. Khalyavin +2
Magnetic order and the underlying magnetic model of the multiferroic pyroxene NaFeGe2O6 are systematically investigated by neutron powder diffraction, thermodynamic measurements, d…
One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3
Daniel R. Harcombe, Philip G. Welch, Pascal Manuel +2
A combination of variable-temperature neutron scattering, reverse Monte Carlo analysis and direct Monte Carlo simulation is used to characterise the emergence of magnetic order in…
Magnetic-field-induced ordering in a spin-1/2 chiral chain
Rebecca Scatena, Alberto Hernandez-Melian, Benjamin M. Huddart +12
We present neutron diffraction, muon spin rotation and pulsed-field magnetometry measurements on the Heisenberg quantum chiral chain [Cu(pym)(H2O)4]SiF6.H2O, which displays a four-…
Complex Magnetic Ordering in Candidate Topological Superconductors
Purnima P. Balakrishnan, Hemian Yi, Zi-Jie Yan +13
The search for chiral topological superconductivity in magnetic topological insulator (TI)-FeTe heterostructures is a key frontier in condensed matter physics, with potential appli…
Unusual effects of magnetic dilution in the ferrimagnetic columnar ordered perovskites
Anuradha M. Vibhakar, Dmitry D. Khalyavin, Pascal Manuel +4
Powder neutron diffraction experiments have been employed to establish the effects of site-selective magnetic dilution in the Sm2MnMnMn4-x Tix O12 A-site columnar ordered quadruple…
Nature of Partial Magnetic Order in the Frustrated Antiferromagnet Gd2Ti2O7
Joseph A. M. Paddison, Georg Ehlers, Andrew B. Cairns +9
Partially-ordered magnets are distinct from both spin liquids and conventional ordered magnets because order and disorder coexist in the same magnetic phase. Here, we determine the…
Spin and orbital ordering in TlMnO3: Neutron diffraction study
Dmitry D. Khalyavin, Pascal Manuel, Wei Yi +1
Crystal and magnetic structures of the high-pressure stabilized perovskite phase of TlMnO3 have been studied by neutron powder diffraction. The crystal structure involves two types…
Magnetically induced metal-insulator transition in Pb2CaOsO6
Henrik Jacobsen, Hai L. Feng, Andrew J. Princep +14
We report on the structural, magnetic, and electronic properties of two new double-perovskites synthesized under high pressure; Pb2CaOsO6 and Pb2ZnOsO6. Upon cooling below 80 K, Pb…
Anisotropy in the magnetization and magnetoelectric response of single crystalline MnTaO
Soumendra Nath Panja, Pascal Manuel, Sunil Nair
We report temperature dependent magnetization and neutron diffraction measurements on the corundum related magnetoelectric antiferromagnet MnTaO. Measurements per…
Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
Sevda Avci, Omar Chmaissem, Stephan Rosenkranz +12
A theory of superconductivity in the iron-based materials requires an understanding of the phase diagram of the normal state. In these compounds, superconductivity emerges when str…
Electrical and thermal magnetotransport in altermagnetic CrSb
Sajal Naduvile Thadathil, Christoph Müller, Reza Firouzmandi +20
Chromium antimonide has emerged as a key material platform for studying altermagnetism because of its simple binary composition, high Néel temperature, and semimetallic electronic…
Charge order at the frontier between the molecular and solid states in Ba3NaRu2O9
Simon A. J. Kimber, Mark S. Senn, Simone Fratini +6
We show that the valence electrons of Ba3NaRu2O9, which has a quasi-molecular structure, completely crystallize below 210 K. Using an extended Hubbard model, we show that the charg…
Large Easy Axis Anisotropy in the One-Dimensional Magnet BaMo(PO)
Aly H. Abdeldaim, Danis I. Badrtdinov, Alexandra S. Gibbs +9
We present an extensive experimental and theoretical study on the low-temperature magnetic properties of the monoclinic anhydrous alum compound BaMo(PO). The magnetic susce…
Spin Jahn-Teller antiferromagnetism in CoTiO
Franziska K. K. Kirschner, Roger D. Johnson, Franz Lang +5
We have used neutron powder diffraction to solve the magnetic structure of orthorhombic CoTiO, showing that the long-range ordered state below 26 K identified in our muon-s…
Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure
Lei Ding, Lihua Chu, Pascal Manuel +4
Exchange bias (EB) refers to a shift of the hysteresis loop along the field axis in materials consisting of ferromagnetic (FM) and antiferromagnetic (AFM) layers, generally after a…
Magnetic ground state of a prototype quasicrystal approximant: a candidate for octahedral spin ice physics
Leonie Woodland, Farid Labib, Dmitry Khalyavin +4
Magnetic ordering in quasicrystals has recently emerged as a fertile ground for discovering unconventional magnetic states beyond the framework of periodic crystals. However, eluci…
Successive magnetic phase transitions with magnetoelastic and magnetodielectric coupling in the ordered triple perovskite SrCaRuO
Arun Kumar, Pascal Manuel, Sunil Nair
We report a comprehensive temperature-dependent investigation of the 1:2 ordered triple perovskite system SrCaRuO. It crystallizes in the monoclinic structure with spac…
Investigating the magnetic ground state of the skyrmion host material CuOSeO using long-wavelength neutron diffraction
Kévin J. A. Franke, Philip R. Dean, Monica Ciomaga Hatnean +6
We present long-wavelength neutron diffraction data measured on both single crystal and polycrystalline samples of the skyrmion host material CuOSeO. We observe magneti…
Realising square and diamond lattice Heisenberg antiferromagnet models in the and phases of the coordination framework, KTi(CO)\textit{x}HO
Aly H. Abdeldaim, Teng Li, Lewis Farrar +7
We report the crystal structures and magnetic properties of two psuedo-polymorphs of the Ti coordination framework, KTi(CO)xHO. Single-crystal X…