Evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy

S. Tsuda, T. Yokoya, T. Kiss, Y. Takano, K. Togano, H. Kito, H. Ihara, S. Shin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We study the new binary intermetallic superconductor MgB2 using high-resolution photoemission spectroscopy. The superconducting-state spectrum measured at 5.4 K shows a coherent peak with a shoulder structure, in sharp contrast to that expected from a simple isotropic-gap opening. The spectrum can be well reproduced using the weighted sum of two Dynes functions with the gap sizes of 1.7 and 5.6 meV. Temperature-dependent study shows that both gaps close at the bulk transition temperature. These results provide spectroscopic evidence for a multiple gap of MgB2.

Original languageEnglish
Pages (from-to)177006-1-177006-4
JournalPhysical Review Letters
Volume87
Issue number17
DOIs
Publication statusPublished - Oct 22 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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