MgB2 energy gap determination by scanning tunnelling spectroscopy

T. W. Heitmann; S. D. Bu; D. M. Kim; J. H. Choi; J. Giencke; C. B. Eom; K. A. Regan; N. Rogado; M. A. Hayward; T. He; J. S. Slusky; P. Khalifah; M. Haas; R. J. Cava; D. C. Larbalestier; M. S. Rzchowski

doi:10.1088/0953-2048/17/2/001

MgB₂ energy gap determination by scanning tunnelling spectroscopy

T. W. Heitmann
, S. D. Bu
, D. M. Kim
, J. H. Choi
, J. Giencke
, C. B. Eom
, K. A. Regan
, N. Rogado
, M. A. Hayward
, T. He
, J. S. Slusky
, P. Khalifah
, M. Haas
, R. J. Cava
, D. C. Larbalestier
, M. S. Rzchowski

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

5 Scopus citations

Abstract

We report scanning tunnelling spectroscopy (STS) measurements of the gap properties of both ceramic MgB₂ and c-axis oriented epitaxial MgB₂ thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunnelling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap Δ = 2.2-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, Δ = 7.2 meV, consistent with a proposed two-hand model.

Original language	English (US)
Pages (from-to)	237-242
Number of pages	6
Journal	Superconductor Science and Technology
Volume	17
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/17/2/001
State	Published - Feb 2004

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/17/2/001

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Heitmann, T. W., Bu, S. D., Kim, D. M., Choi, J. H., Giencke, J., Eom, C. B., Regan, K. A., Rogado, N., Hayward, M. A., He, T., Slusky, J. S., Khalifah, P., Haas, M., Cava, R. J., Larbalestier, D. C., & Rzchowski, M. S. (2004). MgB₂ energy gap determination by scanning tunnelling spectroscopy. Superconductor Science and Technology, 17(2), 237-242. https://doi.org/10.1088/0953-2048/17/2/001

@article{961537e289e542c98f45bab1d7bca367,

title = "MgB2 energy gap determination by scanning tunnelling spectroscopy",

abstract = "We report scanning tunnelling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunnelling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap Δ = 2.2-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, Δ = 7.2 meV, consistent with a proposed two-hand model.",

author = "Heitmann, \{T. W.\} and Bu, \{S. D.\} and Kim, \{D. M.\} and Choi, \{J. H.\} and J. Giencke and Eom, \{C. B.\} and Regan, \{K. A.\} and N. Rogado and Hayward, \{M. A.\} and T. He and Slusky, \{J. S.\} and P. Khalifah and M. Haas and Cava, \{R. J.\} and Larbalestier, \{D. C.\} and Rzchowski, \{M. S.\}",

year = "2004",

month = feb,

doi = "10.1088/0953-2048/17/2/001",

language = "English (US)",

volume = "17",

pages = "237--242",

journal = "Superconductor Science and Technology",

issn = "0953-2048",

publisher = "IOP Publishing Ltd.",

number = "2",

}

TY - JOUR

T1 - MgB2 energy gap determination by scanning tunnelling spectroscopy

AU - Heitmann, T. W.

AU - Bu, S. D.

AU - Kim, D. M.

AU - Choi, J. H.

AU - Giencke, J.

AU - Eom, C. B.

AU - Regan, K. A.

AU - Rogado, N.

AU - Hayward, M. A.

AU - He, T.

AU - Slusky, J. S.

AU - Khalifah, P.

AU - Haas, M.

AU - Cava, R. J.

AU - Larbalestier, D. C.

AU - Rzchowski, M. S.

PY - 2004/2

Y1 - 2004/2

N2 - We report scanning tunnelling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunnelling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap Δ = 2.2-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, Δ = 7.2 meV, consistent with a proposed two-hand model.

AB - We report scanning tunnelling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunnelling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap Δ = 2.2-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, Δ = 7.2 meV, consistent with a proposed two-hand model.

UR - https://www.scopus.com/pages/publications/10744226914

UR - https://www.scopus.com/pages/publications/10744226914#tab=citedBy

U2 - 10.1088/0953-2048/17/2/001

DO - 10.1088/0953-2048/17/2/001

M3 - Article

AN - SCOPUS:10744226914

SN - 0953-2048

VL - 17

SP - 237

EP - 242

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 2

ER -

MgB₂ energy gap determination by scanning tunnelling spectroscopy

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