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Publications (26)

cond-mat.str-el1998

Anomalous Low Temperature States in CeNi2Ge2

F. M. Grosche, P. Agarwal, S. R. Julian +7

Ambient pressure studies on high purity single crystals of the stoichiometric 4f-electron metal CeNi2Ge2 reveal anomalous low temperature forms of the resistivity which challenge o…

cond-mat.str-el2025

Strange metallicity encompasses high magnetic field-induced superconductivity in UTe2

T. I. Weinberger, H. Chen, Z. Wu +9

A strange metallic state - characterized by an electrical resistivity that rises linearly in temperature $T$ at a rate governed by Planckian energetic dissipation - is present in a…

cond-mat.supr-con2018

Evidence of a structural quantum critical point in (Ca $_{x}$ Sr $_{1 - x}$ ) $_{3}$ Rh $_{4}$ Sn $_{13}$ from a lattice dynamics study

Y. W. Cheung, Y. J. Hu, M. Imai +11

Approaching a quantum critical point (QCP) has been an effective route to stabilize superconductivity. While the role of magnetic QCPs has been extensively discussed, similar explo…

cond-mat.supr-con2014

Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi $_{2}$ Se $_{2 - x}$ S $_{x}$

S. K. Goh, H. C. Chang, P. Reiss +9

We report the pressure dependence of the superconducting transition temperature, $T_{c}$ , in TlNi $_{2}$ Se $_{2 - x}$ S $_{x}$ detected via the AC susceptibility method. The pressure-temperatu…

cond-mat.str-el2000

Superconductivity on the threshold of magnetism in CePd2Si2 and CeIn3

F. M. Grosche, I. R. Walker, S. R. Julian +4

The magnetic ordering temperature of some rare earth based heavy fermion compounds is strongly pressure-dependent and can be completely suppressed at a critical pressure, p $_{c}$ , ma…

cond-mat.str-el2022

Muon spin rotation and relaxation study on Nb $_{1 - y}$ Fe $_{2 + y}$

J. Willwater, D. Eppers, T. Kimmel +5

We present a detailed study of the magnetic properties of weakly ferromagnetic/quantum critical Nb $_{1 - y}$ Fe $_{2 + y}$ using muon spin rotation and relaxation ( $I^¼$ SR). By means of a…

cond-mat.supr-con2024

Enhanced triplet superconductivity in next generation ultraclean UTe2

Z. Wu, T. I. Weinberger, J. Chen +17

The unconventional superconductor UTe $_{2}$ exhibits numerous signatures of spin-triplet superconductivity -- a rare state of matter which could enable quantum computation protected…

cond-mat.str-el2014

Fermi liquid breakdown and evidence for superconductivity in YFe $_{2}$ Ge $_{2}$

Y. Zou, Z. Feng, P. W. Logg +3

In the d-electron system YFe $_{2}$ Ge $_{2}$ , an unusually high and temperature dependent Sommerfeld ratio of the specific heat capacity $C / T \sim 100 mJ/ (mol K^{2})$ and an anomal…

cond-mat.str-el2005

Non-Fermi liquid states in the pressurized $C e C u_{2} (S i_{1 - x} G e_{x})_{2}$ system: two critical points

H. Q. Yuan, F. M. Grosche, M. Deppe +3

In the archetypal strongly correlated electron superconductor CeCu $_{2}$ Si $_{2}$ and its Ge-substituted alloys CeCu $_{2}$ (Si $_{1 - x}$ Ge $_{x}$ ) $_{2}$ two quantum phase transitions -- one mag…

cond-mat.str-el2015

Large Fermi Surface of Heavy Electrons at the Border of Mott Insulating State in NiS2

S. Friedemann, H. Chang, M. B. GamÅ¼a +7

One of the early triumphs of quantum physics is the explanation why some materials are metallic whereas others are insulating. While a treatment based on single electron states cor…

cond-mat.str-el2009

Magnetism in Nb(1-y)Fe(2+y) - composition and magnetic field dependence

D. Moroni-Klementowicz, M. Brando, C. Albrecht +4

We present a systematic study of transport and thermodynamic properties of the Laves phase system Nb $_{1 - y}$ Fe $_{2 + y}$ . Our measurements confirm that Fe-rich samples, as well as th…

cond-mat.str-el2011

Shubnikov-de Haas measurements on LuRh2Si2

S. Friedemann, S. K. Goh, F. M. Grosche +2

We present Shubnikov-de Haas measurements on LuRh2Si2, the non-magnetic reference compound to the prototypical heavy-fermion system YbRh2Si2. We find an extensive set of orbits wit…

cond-mat.supr-con2015

Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Ca $_{x}$ Sr $_{1 - x}$ ) $_{3}$ Rh $_{4}$ Sn $_{13}$

S. K. Goh, D. A. Tompsett, P. J. Saines +5

The quasi-skutterudite superconductor Sr $_{3}$ Rh $_{4}$ Sn $_{13}$ features a pronounced anomaly in electrical resistivity at $T^{*} \sim$ 138 K. We show that the anomaly is caused by a secon…

cond-mat.str-el2023

Flat Bands at the Fermi Level in Unconventional Superconductor YFe2Ge2

R. Kurleto, C. -H. Wu, S. Acharya +15

We report heavy electron behavior in unconventional superconductor YFe $_{2}$ Ge $_{2}$ ( $T_{C} = 1.2$ K). We directly observe very heavy bands ( $m_{eff} \sim 25 m_{e}$ ) within $\…

cond-mat.supr-con2024

Quantum interference between quasi-2D Fermi surface sheets in UTe2

T. I. Weinberger, Z. Wu, D. E. Graf +11

UTe $_{2}$ is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurement…

cond-mat.str-el2010

Doping driven magnetic instabilities and quantum criticality of NbFe $_{2}$

D. A. Tompsett, R. J. Needs, F. M. Grosche +1

Using density functional theory we investigate the evolution of the magnetic ground state of NbFe $_{2}$ due to doping by Nb-excess and Fe-excess. We find that non-rigid-band effect…

cond-mat.str-el2019

Ultra-small moment incommensurate spin density wave order masking a ferromagnetic quantum critical point in NbFe $_{2}$

P. G. Niklowitz, M. Hirschberger, M. Lucas +8

In the metallic magnet Nb $_{1 - y}$ Fe $_{2 + y}$ , the low temperature threshold of ferromagnetism can be investigated by varying the Fe excess $y$ within a narrow homogeneity range. We…

cond-mat.supr-con2013

Separation of antiferromagnetism and high-temperature superconductivity in Ca $_{1 - x}$ La $_{x}$ Fe $_{2}$ As $_{2}$ under pressure

Shanta R. Saha, T. Drye, S. K. Goh +9

We report the effect of applied pressures on magnetic and superconducting order in single crystals of the aliovalent La-doped iron pnictide material Ca $_{1 - x}$ La $_{x}$ Fe $_{2}$ As$_{…

cond-mat.supr-con2025

A quantum critical line bounds the high field metamagnetic transition surface in UTe $_{2}$

Z. Wu, T. I. Weinberger, A. J. Hickey +16

Quantum critical phenomena are widely studied across various materials families, from high temperature superconductors to magnetic insulators. They occur when a thermodynamic phase…

cond-mat.supr-con2024

Quasi-2D Fermi surface in the anomalous superconductor UTe2

A. G. Eaton, T. I. Weinberger, N. J. M. Popiel +16

The heavy fermion paramagnet UTe $_{2}$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details of this exotic superconducti…

cond-mat.supr-con2025

Pressure-enhanced $f$ -electron orbital weighting in UTe2 mapped by quantum interferometry

T. I. Weinberger, Z. Wu, A. J. Hickey +11

The phase landscape of UTe $_{2}$ features a remarkable diversity of superconducting phases under applied pressure and magnetic field. Recent quantum oscillation studies at ambient pr…

cond-mat.str-el2025

Spin-density wave of ferrimagnetic building blocks masking the ferromagnetic quantum-critical point in NbFe2

T. Poulis, G. Mani, J. Sturt +11

In the metallic magnet NbFe2, the low temperature threshold of ferromagnetism can be investigated by varying the Fe concentration within a narrow homogeneity range. NbFe2 is one of…

cond-mat.supr-con2009

High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress

W. J. Duncan, O. P. Welzel, C. Harrison +4

We investigate the evolution of the electrical resistivity of BaFe2As2 single crystals with pressure. The samples used were from the same batch grown from self flux and showed prop…

cond-mat.str-el2015

Metallic Quantum Ferromagnets

M. Brando, D. Belitz, F. M. Grosche +1

This review gives an overview of the quantum phase transition (QPT) problem in metallic ferromagnets, discussing both experimental and theoretical aspects. These QPTs can be classi…

cond-mat.supr-con2011

Enhancement of the Superconducting Transition Temperature under Pressure in Rare-Earth Doped Ca $_{1 - x}$ La $_{x}$ Fe $_{2}$ As $_{2}$ (x=0.27)

Swee K. Goh, Lina E. Klintberg, J. M. Silver +5

We report measurements of the pressure dependence of the superconducting transition temperature T_c in single crystal samples of the rare-earth doped superconductor Ca $_{0.73}$ La$_…

cond-mat.str-el2011

Transport and Thermodynamic Evidence for a Marginal Fermi Liquid State in ZrZn $_{2}$

Mike Sutherland, R. P. Smith, N. Marcano +7

Measurements of low temperature transport and thermodynamic properties have been used to characterize the non-Fermi liquid state of the itinerant ferromagnet ZrZn $_{2}$ . We observe a…

Publications (26)

Anomalous Low Temperature States in CeNi2Ge2

Strange metallicity encompasses high magnetic field-induced superconductivity in UTe2

Evidence of a structural quantum critical point in (Cax​Sr1−x​)3​Rh4​Sn13​ from a lattice dynamics study

Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi2​Se2−x​Sx​

Superconductivity on the threshold of magnetism in CePd2Si2 and CeIn3

Muon spin rotation and relaxation study on Nb1−y​Fe2+y​

Enhanced triplet superconductivity in next generation ultraclean UTe2

Fermi liquid breakdown and evidence for superconductivity in YFe2​Ge2​

Non-Fermi liquid states in the pressurized CeCu2​(Si1−x​Gex​)2​ system: two critical points

Large Fermi Surface of Heavy Electrons at the Border of Mott Insulating State in NiS2

Magnetism in Nb(1-y)Fe(2+y) - composition and magnetic field dependence

Shubnikov-de Haas measurements on LuRh2Si2

Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Cax​Sr1−x​)3​Rh4​Sn13​

Flat Bands at the Fermi Level in Unconventional Superconductor YFe2Ge2

Quantum interference between quasi-2D Fermi surface sheets in UTe2

Doping driven magnetic instabilities and quantum criticality of NbFe2​

Ultra-small moment incommensurate spin density wave order masking a ferromagnetic quantum critical point in NbFe2​

Separation of antiferromagnetism and high-temperature superconductivity in Ca1−x​Lax​Fe2​As2​ under pressure

A quantum critical line bounds the high field metamagnetic transition surface in UTe2​

Quasi-2D Fermi surface in the anomalous superconductor UTe2

Pressure-enhanced f-electron orbital weighting in UTe2 mapped by quantum interferometry

Spin-density wave of ferrimagnetic building blocks masking the ferromagnetic quantum-critical point in NbFe2

High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress

Metallic Quantum Ferromagnets

Enhancement of the Superconducting Transition Temperature under Pressure in Rare-Earth Doped Ca1−x​Lax​Fe2​As2​ (x=0.27)

Transport and Thermodynamic Evidence for a Marginal Fermi Liquid State in ZrZn2​

Evidence of a structural quantum critical point in (Ca $_{x}$ Sr $_{1 - x}$ ) $_{3}$ Rh $_{4}$ Sn $_{13}$ from a lattice dynamics study

Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi $_{2}$ Se $_{2 - x}$ S $_{x}$

Muon spin rotation and relaxation study on Nb $_{1 - y}$ Fe $_{2 + y}$

Fermi liquid breakdown and evidence for superconductivity in YFe $_{2}$ Ge $_{2}$

Non-Fermi liquid states in the pressurized $C e C u_{2} (S i_{1 - x} G e_{x})_{2}$ system: two critical points

Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Ca $_{x}$ Sr $_{1 - x}$ ) $_{3}$ Rh $_{4}$ Sn $_{13}$

Doping driven magnetic instabilities and quantum criticality of NbFe $_{2}$

Ultra-small moment incommensurate spin density wave order masking a ferromagnetic quantum critical point in NbFe $_{2}$

Separation of antiferromagnetism and high-temperature superconductivity in Ca $_{1 - x}$ La $_{x}$ Fe $_{2}$ As $_{2}$ under pressure

A quantum critical line bounds the high field metamagnetic transition surface in UTe $_{2}$

Pressure-enhanced $f$ -electron orbital weighting in UTe2 mapped by quantum interferometry

Enhancement of the Superconducting Transition Temperature under Pressure in Rare-Earth Doped Ca $_{1 - x}$ La $_{x}$ Fe $_{2}$ As $_{2}$ (x=0.27)

Transport and Thermodynamic Evidence for a Marginal Fermi Liquid State in ZrZn $_{2}$