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 journalArticle

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 2002
Externally publishedYes

Fingerprint

Photoelectron spectroscopy
photoelectric emission
spectroscopy
Photoemission
Superconducting transition temperature
shoulders
transition temperature
high resolution
simulation

Keywords

  • MgB
  • Multiple superconducting-gap
  • PES

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy. / Tsuda, Shunsuke; Yokoya, Takayoshi; Kiss, Takayuki; Chainani, Ashish; Takano, Yoshihiko; Togano, Kazumasa; Kito, Hijiri; Ihara, Hideo; Shin, Shik.

In: Physica B: Condensed Matter, Vol. 312-313, 03.2002, p. 150-151.

Research output: Contribution to journalArticle

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, vol. 312-313, pp. 150-151. https://doi.org/10.1016/S0921-4526(01)01282-0
Tsuda, Shunsuke ; Yokoya, Takayoshi ; Kiss, Takayuki ; Chainani, Ashish ; Takano, Yoshihiko ; Togano, Kazumasa ; Kito, Hijiri ; Ihara, Hideo ; Shin, Shik. / Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy. In: Physica B: Condensed Matter. 2002 ; Vol. 312-313. pp. 150-151.
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