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

Research output: Contribution to journalArticle

6 Citations (Scopus)

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. |S/T| 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 Hc2(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 τc(ε) at the Fermi level under magnetic fields.

Original languageEnglish
Article number241101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number24
DOIs
Publication statusPublished - 2015 Dec 2
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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