Hidden low-temperature instability in PrOs4Sb12

被引：0

作者：

Grube, K. ^{[1
]}

Zaum, S. ^{[1
,2
]}

Bauer, E. D. ^{[3
]}

Maple, M. B. ^{[4
]}

v. Loehneysen, H. ^{[1
,2
]}

机构：

[1] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[2] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2010年 / 247卷 / 03期

关键词：

PHASE-DIAGRAM; FERMION; SUPERCONDUCTIVITY;

D O I：

10.1002/pssb.200983070

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The low-temperature behavior of many correlated electron systems is characterized by the appearance of macroscopically ordered states that show a dome-shaped evolution of their transition temperatures as a function of non-thermal control parameters. In the heavy-fermion compound PrOs4Sb12, a field-induced phase emerges in a magnetic field range between B approximate to 4.5 and 13.5 T. The phase is characterized by antiferroquadrupolar (AFQ) ordering of the Pr3+ ions. We measured the specific heat of PrOs4Sb12 single crystals in magnetic fields up to B = 14 T parallel to the crystallographic [100] direction to determine the entropy S as a function of T and B. Above the maximum AFQ transition temperature, the entropy S(T = const, B) reveals a pronounced maximum. We show that this maximum can be related to a low-temperature instability which is produced by the degeneracy of the lowest crystalline electric field (CEF) energy levels. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：571 / 573

页数：3

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