BCS-like density of states in superconducting A3C60 surfaces

被引：31

作者：

Hesper, R ^{[1
]}

Tjeng, LH ^{[1
]}

Heeres, A ^{[1
]}

Sawatzky, GA ^{[1
]}

机构：

[1] Univ Groningen, Ctr Mat Sci, Solid State Phys Lab, NL-9747 AG Groningen, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.85.1970

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on an ultrahigh resolution photoemission study on the topmost molecular layer of K3C60 and Rb3C60 films below and above the superconducting transition temperature T-C. We observed not only clear evidence for the opening of the superconducting gap, but also a modification in the photoemission line shape consistent with a change from a normal-metallic to a BCS-like density of states, including the formation of a condensation peak. The data can be accurately modeled by a BCS-type function with a gap Delta derived from T-C in the weak-coupling limit (2 Delta/k(B)T(C) = 3.53).

引用

页码：1970 / 1973

页数：4

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