Definitive experimental evidence for two-band superconductivity in MgB2

被引：132

作者：

Tsuda, S ^{[1
]}

Yokoya, T

Takano, Y

Kito, H

Matsushita, A

Yin, F

Itoh, J

Harima, H

Shin, S

机构：

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

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[4] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

[5] RIKEN, Inst Phys & Chem Res, Hyogo 6795143, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.91.127001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The superconducting-gap of MgB2 has been studied by high-resolution angle-resolved photoemission spectroscopy. The results show that superconducting gaps with values of 5.5 and 2.2 meV open on the sigma band and the pi band, respectively, but both the gaps close at the bulk transition temperature, providing a definitive experimental evidence for the two-band superconductivity with strong interband pairing interaction in MgB2. The experiments validate the role of k-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature of MgB2.

引用

页数：4

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