Gap function with point nodes in borocarbide superconductor YNi2B2C -: art. no. 137006

被引：178

作者：

Izawa, K ^{[1
]}

Kamata, K

Nakajima, Y

Matsuda, Y

Watanabe, T

Nohara, M

Takagi, H

Thalmeier, P

Maki, K

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[3] Univ Tokyo, Dept Adv Mat Sci, Bunkyo Ku, Tokyo 1130033, Japan

[4] Max Planck Inst Chem Phys Solid, D-01187 Dresden, Germany

[5] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.89.137006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

To determine the superconducting gap function of YNi2B2C, the c-axis thermal conductivity kappa(zz) was measured in H rotated in various directions. The angular variation of kappa(zz) in H rotated within the ab plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when H is rotated conically around the c axis with a tilt angle of 45degrees. These results provide the first compelling evidence that the gap function has point nodes located along the a and b axes. This unprecedented gap structure challenges the current view on the pairing mechanism.

引用

页数：4

共 35 条

[1] Angular position of nodes in the superconducting gap of YBCO [J].