Enhancing the superconducting transition temperature of CeRh1-xIrxIn5 due to the strong-coupling effects of antiferromagnetic spin fluctuations:: An 115In nuclear quadrupole resonance study

被引：35

作者：

Kawasaki, S ^{[1
]}

Yashima, M

Mugino, Y

Mukuda, H

Kitaoka, Y

Shishido, H

Onuki, Y

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Dept Mat Engn Sci, Toyonaka, Osaka 5608531, Japan

[2] Osaka Univ, Grad Sch Sci, Dept Phys, Toyonaka, Osaka 5600043, Japan

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.96.147001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on systematic evolutions of antiferromagnetic (AFM) spin fluctuations and unconventional superconductivity (SC) in heavy-fermion (HF) compounds CeRh1-xIrxIn5 via an In-115 nuclear-quadrupole-resonance experiment. The nuclear spin-lattice relaxation rate 1/T-1 has revealed the marked development of AFM spin fluctuations as approaching an AFM ordered state. Concomitantly, the superconducting transition temperature T-c and the energy gap Delta(0) increase drastically from T-c=0.4 K and 2 Delta(0)/k(B)T(c)=5 in CeIrIn5 up to T-c=1.2 K and 2 Delta(0)/k(B)T(c)=8.3 in CeRh0.3Ir0.7In5, respectively. The present work suggests that the AFM spin fluctuations in close proximity to the AFM quantum critical point are indeed responsible for the strong-coupling unconventional SC in HF compounds.

引用

页数：4

共 32 条

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