Elastic constant in magnetic fields and singlet-triplet state of heavy fermion superconductor PrOS4Sb12

被引：21

作者：

Goto, T ^{[1
]}

Nemoto, Y

Onuki, K

Sakai, K

Yamaguchi, T

Akatsu, M

Yanagisawa, T

Sugawara, H

Sato, H

机构：

[1] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan

[2] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki 3058568, Japan

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

[4] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan

[5] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2005年 / 74卷 / 01期

关键词：

PrOS4Sb12; rattling; heavy fermion superconductor; ultrasound;

D O I：

10.1143/JPSJ.74.263

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy fermion superconductivity at T-C = 1.85 K. The softening of the elastic constant with decreasing temperature has been found above T-C. The (C-11 - C-12)/2 in applying magnetic fields along the [110] axis at 1.0 K exhibits a minimum around 8 T, which is well accounted for by the one-ion quadrupolar susceptibility reflecting the level crossing of one of an excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. The softening of (C-11 - C-12)/2 proportional to reciprocal temperature just above T-C may be dominated by the tunneling of an off-center Pr-ion in an Sb-icosahedron cage.

引用

页码：263 / 266

页数：4

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