Pr deficiency effect on the heavy-fermion superconductor PrxOs4Sb12

被引：0

作者：

Aoki, Y. ^{[1
]}

Imamura, A. ^{[1
]}

Miyazaki, R. ^{[1
]}

Saito, T. ^{[1
]}

Higashinaka, R. ^{[1
]}

Umegaki, I. ^{[1
]}

Fukuhara, T. ^{[2
]}

Sato, H. ^{[1
]}

机构：

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

[2] Toyama Prefectural Univ, Dept Liberal Arts & Sci, Toyama 9390398, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷

关键词：

Heavy fermion; PrOs4Sb12; Filled skutterudite; Crystalline electric field;

D O I：

10.1016/j.physc.2009.11.037

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have succeeded in growing single-crystalline samples of the filled-skutterudite heavy-fermion superconductor PrxOs4Sb12 having different Pr occupancy x by controlling the maximum temperature in Sb-flux sample growing process. From systematic measurements of the superconducting and normal state properties, it has been found that the superconducting transition temperature T-c and the energy splitting Delta between the singlet and triplet crystalline-electric-field (CEF) levels decrease significantly with decreasing x, much faster than the case for the La ion substitution in (PrxLa1-x)Os4Sb12. The observed correlation between T-c and Delta supports the idea that the CEF excitations of Pr 4f-electrons play a major role for the realization of the superconducting state in PrOs4Sb12. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：S545 / S547

页数：3

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