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

doi:10.1016/S0921-4526(01)01282-0

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 journal › Conference article › peer-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 language	English
Pages (from-to)	150-151
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	312-313
DOIs	https://doi.org/10.1016/S0921-4526(01)01282-0
Publication status	Published - Mar 2002
Externally published	Yes
Event	International Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States Duration: Aug 6 2002 → Aug 6 2002

Keywords

MgB
Multiple superconducting-gap
PES

ASJC Scopus subject areas

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

Access to Document

10.1016/S0921-4526(01)01282-0

Cite this

@article{9ca3cff1092d457c82828e0ce91add26,

title = "Superconducting gap of MgB2 observed using ultrahigh-resolution photoemission spectroscopy",

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.",

keywords = "MgB, Multiple superconducting-gap, PES",

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

note = "Funding Information: This work was supported by grants from the Ministry of Education, Culture and Science of Japan. ; International Conference on Strongly Correlated Electrons ; Conference date: 06-08-2002 Through 06-08-2002",

year = "2002",

month = mar,

doi = "10.1016/S0921-4526(01)01282-0",

language = "English",

volume = "312-313",

pages = "150--151",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

}

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

AU - Takano, Yoshihiko

AU - Togano, Kazumasa

AU - Kito, Hijiri

AU - Ihara, Hideo

AU - Shin, Shik

N1 - Funding Information: This work was supported by grants from the Ministry of Education, Culture and Science of Japan.

PY - 2002/3

Y1 - 2002/3

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.

KW - MgB

KW - Multiple superconducting-gap

KW - PES

UR - http://www.scopus.com/inward/record.url?scp=0036503467&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036503467&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(01)01282-0

DO - 10.1016/S0921-4526(01)01282-0

M3 - Conference article

AN - SCOPUS:0036503467

SN - 0921-4526

VL - 312-313

SP - 150

EP - 151

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

T2 - International Conference on Strongly Correlated Electrons

Y2 - 6 August 2002 through 6 August 2002

ER -