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
收藏
页码：571 / 573
页数：3
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