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 articlepeer-review

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 - 2002 Mar 1
EventInternational Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States
Duration: 2002 Aug 62002 Aug 6

All Science Journal Classification (ASJC) codes

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

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