TY - JOUR
T1 - Fermi-Surface Instability in the Heavy-Fermion Superconductor UTe2
AU - Niu, Q.
AU - Knebel, G.
AU - Braithwaite, D.
AU - Aoki, D.
AU - Lapertot, G.
AU - Seyfarth, G.
AU - Brison, J. P.
AU - Flouquet, J.
AU - Pourret, A.
N1 - Publisher Copyright:
© 2020 American Physical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/2/26
Y1 - 2020/2/26
N2 - Transport measurements are presented up to fields of 29 T in the recently discovered heavy-fermion superconductor UTe2 with magnetic field H applied along the easy magnetization a axis of the body-centered orthorhombic structure. The thermoelectric power varies linearly with temperature above the superconducting transition, TSC=1.5 K, indicating that superconductivity develops in a Fermi liquid regime. As a function of field the thermoelectric power shows successive anomalies which appear at critical values of the magnetic polarization. Remarkably, the lowest magnetic field instability for H∥a occurs for the same critical value of the magnetization (0.4 μB) than the first order metamagnetic transition at 35 T for field applied along the b axis. It can be clearly identified as a Lifshitz transition. The estimated number of charge carriers at low temperature reveals a metallic ground state distinct from LDA calculations indicating that strong electronic correlations are a major issue.
AB - Transport measurements are presented up to fields of 29 T in the recently discovered heavy-fermion superconductor UTe2 with magnetic field H applied along the easy magnetization a axis of the body-centered orthorhombic structure. The thermoelectric power varies linearly with temperature above the superconducting transition, TSC=1.5 K, indicating that superconductivity develops in a Fermi liquid regime. As a function of field the thermoelectric power shows successive anomalies which appear at critical values of the magnetic polarization. Remarkably, the lowest magnetic field instability for H∥a occurs for the same critical value of the magnetization (0.4 μB) than the first order metamagnetic transition at 35 T for field applied along the b axis. It can be clearly identified as a Lifshitz transition. The estimated number of charge carriers at low temperature reveals a metallic ground state distinct from LDA calculations indicating that strong electronic correlations are a major issue.
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U2 - 10.1103/PhysRevLett.124.086601
DO - 10.1103/PhysRevLett.124.086601
M3 - Article
C2 - 32167364
AN - SCOPUS:85081787607
VL - 124
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 8
M1 - 086601
ER -