TY - JOUR
T1 - Magnetic-field-induced phenomena in the paramagnetic superconductor Ute2
AU - Knafo, William
AU - Vališka, Michal
AU - Braithwaite, Daniel
AU - Lapertot, Gérard
AU - Knebel, Georg
AU - Pourret, Alexandre
AU - Brison, Jean Pascal
AU - Flouquet, Jacques
AU - Aoki, Dai
N1 - Funding Information:
Acknowledgment This work at the LNCMI was supported by the “Programme Investissements d’Avenir” under the project ANR-11-IDEX-0002-02 (reference ANR-10-LABX-0037-NEXT). We acknowledge the financial support of the Cross-Disciplinary Program on Instrumentation and Detection of CEA, the French Alternative Energies and Atomic Energy Commission, and KAKENHI (JP15H05882, JP15H05884, JP15K21732, JP16H04006, JP15H05745, JP19H00646). We acknowledge discussions with A. Miyake at ISSP-Tokyo and M. Nardone, A. Zitouni, and J. Béard at LNCMI-Toulouse.
PY - 2019
Y1 - 2019
N2 - We present magnetoresistivity measurements on the heavy-fermion superconductor UTe2 in pulsed magnetic fields μ0H up to 68T and temperatures T from 1.4 to 80K. Magnetic fields applied along the three crystallographic directions a (easy magnetic axis), b, and c (hard magnetic axes), are found to induce different phenomena—depending on the field direction—beyond the low-field suppression of the superconducting state. For H ∥ a, a broad anomaly in the resistivity is observed at 0H ’ 10T and T = 1.4K. For H ∥ c, no magnetic transition nor crossover are observed. For H ∥ b, a sharp first-order-like step in the resistivity indicates a metamagnetic transition at the field 0Hm ’ 35T. When the temperature is raised signature of first-order metamagnetism is observed up to a critical endpoint at TCEP ’ 7K. At higher temperatures a crossover persists up to 28K, i.e., below the temperature Tmax ¼ 35K where the magnetic susceptibility is maximal. A sharp maximum in the Fermi-liquid quadratic coefficient A of the low-temperature resistivity is found at Hm. It indicates an enhanced effective mass associated with critical magnetic fluctuations, possibly coupled with a Fermi surface instability. Similarly to the URhGe case, we show that UTe2 is a candidate for field-induced reentrant superconductivity in the proximity of Hm
AB - We present magnetoresistivity measurements on the heavy-fermion superconductor UTe2 in pulsed magnetic fields μ0H up to 68T and temperatures T from 1.4 to 80K. Magnetic fields applied along the three crystallographic directions a (easy magnetic axis), b, and c (hard magnetic axes), are found to induce different phenomena—depending on the field direction—beyond the low-field suppression of the superconducting state. For H ∥ a, a broad anomaly in the resistivity is observed at 0H ’ 10T and T = 1.4K. For H ∥ c, no magnetic transition nor crossover are observed. For H ∥ b, a sharp first-order-like step in the resistivity indicates a metamagnetic transition at the field 0Hm ’ 35T. When the temperature is raised signature of first-order metamagnetism is observed up to a critical endpoint at TCEP ’ 7K. At higher temperatures a crossover persists up to 28K, i.e., below the temperature Tmax ¼ 35K where the magnetic susceptibility is maximal. A sharp maximum in the Fermi-liquid quadratic coefficient A of the low-temperature resistivity is found at Hm. It indicates an enhanced effective mass associated with critical magnetic fluctuations, possibly coupled with a Fermi surface instability. Similarly to the URhGe case, we show that UTe2 is a candidate for field-induced reentrant superconductivity in the proximity of Hm
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U2 - 10.7566/JPSJ.88.063705
DO - 10.7566/JPSJ.88.063705
M3 - Article
AN - SCOPUS:85067296625
VL - 88
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 6
M1 - 063705
ER -