Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13

Yusei Shimizu; Alexandre Pourret; Georg Knebel; Alexandra Palacio-Morales; Dai Aoki

Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13

Yusei Shimizu ¹ Alexandre Pourret ² Georg Knebel ² Alexandra Palacio-Morales ² Dai Aoki ^{2, 3}

1 Institute for Solid State Physics, University of Tokyo

2 IMAPEC - Instrumentation, Material and Correlated Electrons Physics

PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/INAC/PHELIQS

3 Tohoku University [Sendai]

Abstract : We report quite exotic thermoelectric power S in UBe13. At 0 T, the negative S/T continues to strongly enhance down to the superconducting transition temperature with no Fermi-liquid behavior. vertical bar S/T vertical bar is dramatically suppressed and becomes rather modest with increasing field. We have also obtained precise field dependencies of (i) an anomaly in S due to an exotic Kondo effect and (ii) a field-induced anomaly in S/T associated with the anomalous upward H-c2(T). In contrast to the field-sensitive transport property, the normal-state specific heat is magnetically robust, indicating that the largeness of the 5f density of states remains in high fields. This unusual behavior in UBe13 can be explained by a considerable change in the energy derivative of the conduction-electron lifetime tau(c)(epsilon) at the Fermi level under magnetic fields.

Keywords : Low-Temperature Magnetoresistivity High Magnetic-Fields Phase-Diagram Susceptibility U1-xThxBe13 CeCu2Si2

Document type :

Journal articles

Domain :

Physics [physics]

Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01735130
Contributor : Jérôme Planès <>
Submitted on : Thursday, March 15, 2018 - 2:57:33 PM
Last modification on : Wednesday, June 26, 2019 - 3:26:03 PM

Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13

Identifiers

Collections

Citation

Export

Metrics

82

Contact

Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13

Identifiers

Collections

Citation

Export

Share

Metrics

82

Contact