Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy

Shunsuke Tsuda, Takayoshi Yokoya, Takayuki Kiss, Ashish Atma 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 - 2002 Mar 1
EventInternational Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States
Duration: 2002 Aug 62002 Aug 6

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

All Science Journal Classification (ASJC) codes

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

Cite this

Tsuda, Shunsuke ; Yokoya, Takayoshi ; Kiss, Takayuki ; Chainani, Ashish Atma ; 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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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.",
author = "Shunsuke Tsuda and Takayoshi Yokoya and Takayuki Kiss and Chainani, {Ashish Atma} and Yoshihiko Takano and Kazumasa Togano and Hijiri Kito and Hideo Ihara and Shik Shin",
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Tsuda, S, Yokoya, T, Kiss, T, Chainani, AA, 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

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

In: Physica B: Condensed Matter, Vol. 312-313, 01.03.2002, p. 150-151.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy

AU - Tsuda, Shunsuke

AU - Yokoya, Takayoshi

AU - Kiss, Takayuki

AU - Chainani, Ashish Atma

AU - Takano, Yoshihiko

AU - Togano, Kazumasa

AU - Kito, Hijiri

AU - Ihara, Hideo

AU - Shin, Shik

PY - 2002/3/1

Y1 - 2002/3/1

N2 - 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.

AB - 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.

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