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

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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 - http://www.scopus.com/inward/record.url?scp=10744226914&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=10744226914&partnerID=8YFLogxK

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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