Unique spin dynamics and unconventional superconductivity in the layered heavy fermion compound CeIrIn5:: NQR evidence

被引：152

作者：

Zheng, GQ ^{[1
]}

Tanabe, K

Mito, T

Kawasaki, S

Kitaoka, Y

Aoki, D

Haga, Y

Onuki, Y

机构：

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

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

[3] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.86.4664

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report measurements of the In-115 nuclear spin-lattice relaxation rate (1/T-1) between T = 0.09 and 100 K in the new heavy fermion (HF) compound CeIrIn5. Ar 0.4 less than or equal to T less than or equal to 100 K, 1/T-1 is strongly T-dependent, which indicates that CeIrIn5 is much more itinerant than known Ce-based HFs. We find that I/T1T, subtracting that for LaIrIn5, follows a (1 / tau + theta)(3/4) variation with theta = 8 K. We argue that this novel feature points to anisotropic, due to a layered crystal structure, spin fluctuations near a magnetic ordering. The hulk superconductivity sets in at 0.40 K below which the coherence peak is absent and 1/T-1 follows a T-3 variation, which suggests unconventional superconductivity with Line-node gap.

引用

页码：4664 / 4667

页数：4