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

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

Research output: Contribution to journalArticle

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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

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photoelectric emission
high resolution
spectroscopy
shoulders
intermetallics
transition temperature
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy. / Tsuda, S.; Yokoya, Takayoshi; Kiss, T.; Takano, Y.; Togano, K.; Kito, H.; Ihara, H.; Shin, S.

In: Physical Review Letters, Vol. 87, No. 17, 22.10.2001, p. 177006-1-177006-4.

Research output: Contribution to journalArticle

Tsuda, S, Yokoya, T, Kiss, T, Takano, Y, Togano, K, Kito, H, Ihara, H & Shin, S 2001, 'Evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy', Physical Review Letters, vol. 87, no. 17, pp. 177006-1-177006-4. https://doi.org/10.1103/PhysRevLett.87.177006
Tsuda, S. ; Yokoya, Takayoshi ; Kiss, T. ; Takano, Y. ; Togano, K. ; Kito, H. ; Ihara, H. ; Shin, S. / Evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy. In: Physical Review Letters. 2001 ; Vol. 87, No. 17. pp. 177006-1-177006-4.
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