TY - JOUR
T1 - Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13
AU - Shimizu, Yusei
AU - Pourret, Alexandre
AU - Knebel, Georg
AU - Palacio-Morales, Alexandra
AU - Aoki, Dai
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/12/2
Y1 - 2015/12/2
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.92.241101
DO - 10.1103/PhysRevB.92.241101
M3 - Article
AN - SCOPUS:84952309547
VL - 92
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 24
M1 - 241101
ER -