Measurement of the superconducting gap of MgB2 by point contact spectroscopy

Suyoun Lee; Z. G. Khim; Yonuk Chong; S. H. Moon; H. N. Lee; H. G. Kim; B. Oh; Eun Jip Choi

doi:10.1016/S0921-4534(02)01349-7

Measurement of the superconducting gap of MgB₂ by point contact spectroscopy

Suyoun Lee, Z. G. Khim, Yonuk Chong, S. H. Moon, H. N. Lee, H. G. Kim, B. Oh, Eun Jip Choi

Department of Physics

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

We measured the superconducting gap of MgB₂ thin films and pellets by utilizing point contact Andreev reflection method with a gold tip. From more than 100 measurements, we obtained the distribution of the superconducting gap of the material. This distribution shows two peaks, one at 2-3 meV and the other around 6-8 meV while BCS weak coupling limit predicts 5.9 meV. From temperature dependence measurements, we observed energy gap to nearly follow BCS-like behavior. These results also seem to agree well with the recent anisotropic energy gap estimation based on the ab initio calculation from the band structure of MgB₂.

Original language	English
Pages (from-to)	202-207
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	377
Issue number	3
DOIs	https://doi.org/10.1016/S0921-4534(02)01349-7
State	Published - 15 Sep 2002

Keywords

Andreev reflection
Magnesium diboride
Point contact spectroscopy
Superconductivity

Access to Document

10.1016/S0921-4534(02)01349-7

Cite this

@article{f70438dc96bc4368bbdb87ec2f4381c2,

title = "Measurement of the superconducting gap of MgB2 by point contact spectroscopy",

abstract = "We measured the superconducting gap of MgB2 thin films and pellets by utilizing point contact Andreev reflection method with a gold tip. From more than 100 measurements, we obtained the distribution of the superconducting gap of the material. This distribution shows two peaks, one at 2-3 meV and the other around 6-8 meV while BCS weak coupling limit predicts 5.9 meV. From temperature dependence measurements, we observed energy gap to nearly follow BCS-like behavior. These results also seem to agree well with the recent anisotropic energy gap estimation based on the ab initio calculation from the band structure of MgB2.",

keywords = "Andreev reflection, Magnesium diboride, Point contact spectroscopy, Superconductivity",

author = "Suyoun Lee and Khim, {Z. G.} and Yonuk Chong and Moon, {S. H.} and Lee, {H. N.} and Kim, {H. G.} and B. Oh and {Jip Choi}, Eun",

year = "2002",

month = sep,

day = "15",

doi = "10.1016/S0921-4534(02)01349-7",

language = "English",

volume = "377",

pages = "202--207",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

number = "3",

}

TY - JOUR

T1 - Measurement of the superconducting gap of MgB2 by point contact spectroscopy

AU - Lee, Suyoun

AU - Khim, Z. G.

AU - Chong, Yonuk

AU - Moon, S. H.

AU - Lee, H. N.

AU - Kim, H. G.

AU - Oh, B.

AU - Jip Choi, Eun

PY - 2002/9/15

Y1 - 2002/9/15

N2 - We measured the superconducting gap of MgB2 thin films and pellets by utilizing point contact Andreev reflection method with a gold tip. From more than 100 measurements, we obtained the distribution of the superconducting gap of the material. This distribution shows two peaks, one at 2-3 meV and the other around 6-8 meV while BCS weak coupling limit predicts 5.9 meV. From temperature dependence measurements, we observed energy gap to nearly follow BCS-like behavior. These results also seem to agree well with the recent anisotropic energy gap estimation based on the ab initio calculation from the band structure of MgB2.

AB - We measured the superconducting gap of MgB2 thin films and pellets by utilizing point contact Andreev reflection method with a gold tip. From more than 100 measurements, we obtained the distribution of the superconducting gap of the material. This distribution shows two peaks, one at 2-3 meV and the other around 6-8 meV while BCS weak coupling limit predicts 5.9 meV. From temperature dependence measurements, we observed energy gap to nearly follow BCS-like behavior. These results also seem to agree well with the recent anisotropic energy gap estimation based on the ab initio calculation from the band structure of MgB2.

KW - Andreev reflection

KW - Magnesium diboride

KW - Point contact spectroscopy

KW - Superconductivity

UR - http://www.scopus.com/inward/record.url?scp=0037105677&partnerID=8YFLogxK

U2 - 10.1016/S0921-4534(02)01349-7

DO - 10.1016/S0921-4534(02)01349-7

M3 - Article

AN - SCOPUS:0037105677

SN - 0921-4534

VL - 377

SP - 202

EP - 207

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3

ER -

Measurement of the superconducting gap of MgB₂ by point contact spectroscopy

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this