115In-NQR study of heavy-fermion superconductors Ce2MIn8 (M = Co, Rh)

被引：13

作者：

Fukazawa, Hideto ^{[1
]}

Okazaki, Taishi ^{[1
]}

Hirayama, Kenji ^{[1
]}

Kohori, Yoh ^{[1
]}

Chen, Genfu ^{[2
]}

Ohara, Shigeo ^{[2
]}

Sakamoto, Isao ^{[2
]}

Matsumoto, Takehiko ^{[3
]}

机构：

[1] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[2] Nagoya Inst Technol, Dept Elect & Comp Engn, Nagoya, Aichi 4668555, Japan

[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷 / 12期

关键词：

nuclear quadrupole resonance; heavy fermion; superconductivity; dimensionality; quantum critical point;

D O I：

10.1143/JPSJ.76.124703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ce2MIn8 (M = Co, Rh) are heavy-fermion compounds: at ambient pressure, Ce2CoIn8 is a superconductor with T-SC = 0.4 K and Ce2RhIn8 is an antiferromagnet with T-N = 2.8 K and Ce2RhIn8 becomes superconducting below 1.4K at 2.0GPa. Their crystal structure can be viewed as successive layers of the heavy-fermion compounds CeMIn5 and CeIn3. In order to determine their physical properties, we perform a nuclear quadrupole resonance (NQR) measurement of In-115 nuclei of Ce2MIn8. The spin-lattice relaxation rate 1/T-1 of Ce2COIn8 decreases with decreasing temperature T and is proportional to T through T-SC. This is in contrast to the T-1/2 dependence of the 1/T-1 of pressurized Ce2RhIn8 above T-SC.

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页数：5

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