Field-angle dependence of the zero-energy density of states in the unconventional heavy-fermion superconductor CeCoIn5

被引：106

作者：

Aoki, H ^{[1
]}

Sakakibara, T

Shishido, H

Settai, R

Önuki, Y

Miranovic, P

Machida, K

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2708581, Japan

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

[3] Okayama Univ, Dept Phys, Okayama 7008530, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2004年 / 16卷 / 03期

关键词：

D O I：

10.1088/0953-8984/16/3/L02

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Field-angle-dependent specific heat measurements have been made on the heavy-fermion superconductor CeCoIn5 down to similar to0.29 K, in a magnetic field rotating in the tetragonal c-plane. A clear fourfold angular oscillation is observed in the specific heat with the minima (maxima) occurring along the [100] ([110]) directions. Oscillation persists down to low fields H much less than H-c2, thus directly proving the existence of gap nodes. The results indicate that the superconducting gap symmetry is most probably of d(xy) type.

引用

页码：L13 / L19

页数：7

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