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

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10.1016/S0921-4534(02)01349-7

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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",

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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 - https://www.scopus.com/pages/publications/0037105677

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

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