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The Fermi surface and sheet-dependent superconducting gap of MgB2

✍ Scribed by S. Tsuda; T. Yokoya; S. Shin; Y. Takano; H. Kito; A. Matsushita; F. Yin; J. Itoh; H. Harima

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
699 KB
Volume
412-414
Category
Article
ISSN
0921-4534

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✦ Synopsis

The Fermi surface and superconducting gap of MgB 2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the r band and the p band are clearly observed without contaminated by the ''surface-derived'' band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the r band and the p band, respectively, both of which close at the bulk transition temperature ðT c Þ. This result provides an experimental evidence for the two-band superconductivity on MgB 2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature ðT c Þ of MgB 2 .

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