Anomaly of quasi-particle density of states in the vortex state of NbSe2

被引：11

作者：

Hanaguri, T ^{[1
]}

Koizumi, A ^{[1
]}

Takaki, K ^{[1
]}

Nohara, M ^{[1
]}

Takagi, H ^{[1
]}

Kitazawa, K ^{[1
]}

机构：

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

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 329卷

关键词：

vortex state; electronic specific heat coefficient; NbSe2;

D O I：

10.1016/S0921-4526(02)02195-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic field H dependence of the electronic specific heat coefficient gamma was measured in various NbSe2 crystals in the vortex states. With increasing residual resistivity ratio, gamma(H) changed from conventional gamma proportional to H behavior to the strongly sublinear function of H. The sublinear H dependence of gamma is similar to that of nodal superconductors, while NbSe2 is a nodeless superconductor. From measurements on the sample containing columnar defects, we found that the gamma anomaly is brought by quasi-particle states outside of the vortex cores. This result suggests that excess quasi-particle states are generated by Doppler energy shift caused by supercurrent around vortices. (C) 2003 Published by Elsevier Science B.V.

引用

页码：1355 / 1356

页数：2

共 9 条

[1] DISTINGUISHING D-WAVE SUPERCONDUCTORS FROM HIGHLY ANISOTROPIC S-WAVE SUPERCONDUCTORS [J].