Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy

Shunsuke Tsuda, Takayoshi Yokoya, Takayuki Kiss, Ashish Chainani, Yoshihiko Takano, Kazumasa Togano, Hijiri Kito, Hideo Ihara, Shik Shin

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

We study the superconducting gap of MgB2 using high-resolution photoemission. In the spectrum measured at 5.4 K, a coherent peak with a shoulder structure is observed. We find that a simulation using two Dynes functions with the gap sizes of 1.7 and 5.6 meV reproduces the superconducting-state spectrum better than that using a single Dynes function and anisotropic Dynes functions. We also find that both of the smaller and larger gap close at the bulk transition temperature. These results indicate a multiple superconducting gap of MgB2.

Original languageEnglish
Pages (from-to)150-151
Number of pages2
JournalPhysica B: Condensed Matter
Volume312-313
DOIs
Publication statusPublished - Mar 1 2002
Externally publishedYes
EventInternational Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States
Duration: Aug 6 2002Aug 6 2002

Keywords

  • MgB
  • Multiple superconducting-gap
  • PES

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Tsuda, S., Yokoya, T., Kiss, T., Chainani, A., Takano, Y., Togano, K., Kito, H., Ihara, H., & Shin, S. (2002). Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy. Physica B: Condensed Matter, 312-313, 150-151. https://doi.org/10.1016/S0921-4526(01)01282-0