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

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

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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. Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, 92 (24), pp.241101(R). ⟨10.1103/PhysRevB.92.241101⟩. ⟨cea-01735130⟩

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