Specific heat study on Sm-based filled skutterudite phosphides SmT4P12 (T = Fe, Ru and Os)

被引：62

作者：

Matsuhira, K ^{[1
]}

Doi, Y

Wakeshima, M

Hinatsu, Y

Amitsuka, H

Shimaya, Y

Giri, R

Sekine, C

Shirotani, I

机构：

[1] Kyushu Inst Technol, Fac Engn, Kitakyushu, Fukuoka 8048550, Japan

[2] Hokkaido Univ, Div Chem, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

[3] Hokkaido Univ, Div Phys, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

[4] Muroran Inst Technol, Dept Elect & Elect Engn, Muroran, Hokkaido 0508585, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2005年 / 74卷 / 03期

关键词：

filled skutterudite; SmFe4P12; SmRu4P12; SMOs4P12; specific heat; crystalline electric field;

D O I：

10.1143/JPSJ.74.1030

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Sm-based filled skutterudite phosphides SmFe4P12, SmRu4P12 and SmOs4P12 synthesized at high temperatures and high pressures have been studied by specific heat measurements in magnetic fields. SmFe4P12 shows an anomaly at 1.6 K attributed to a ferromagnetic transition. SmRu4P12 shows a metal-insulator transition at 16 K. This transition consists of two successive transitions, which suggests orbital and antiferromagnetic orderings. SmOS4P12 shows a sharp anomaly at 4.5 K due to an antiferromagnetic ordering. We discuss the characteristic behavior of those phase transitions and the crystalline electric field state in SmT4P12 (T = Fe, Ru and Os). Interestingly, the magnetic entropy of SmFe4P12 have only 0.16R ln 2 below the ferromagnetic ordering temperature. This suggests a strong spin fluctuation effect. On the other hand, the variation of magnetic entropy in SmRu4P12 and SmOs4P12 reaches to nearly R In 4 below the ordering temperature.

引用

页码：1030 / 1035

页数：6

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