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 - Funding Information:
The authors thank K. Izawa, S. Hosoi, H. Harima, J. Ishizuka, Y. Yanase, and A. A. Varlamov for stimulating discussions. This work has been supported by the Université Grenoble Alpes and KAKENHI (Grants No. JP15H0082, No. JP15H0084, No. JP15K21732, No. JP19H00646, No. JP16H04006, and No. JP15H05745). We acknowledge support of the LNCMI-CNRS, member the European Magnetic Field Laboratory (EMFL).
Publisher Copyright:
© 2020 American Physical Society.
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.
UR - http://www.scopus.com/inward/record.url?scp=85081787607&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85081787607&partnerID=8YFLogxK
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 -