MgB2 energy gap determination by scanning tunnelling spectroscopy
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 superco...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2004
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| _version_ | 1797086787482419200 |
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| author | Heitmann, T Bu, S Kim, D Choi, J Giencke, J Eom, C Regan, K Rogado, N Hayward, M He, T Slusky, J Khalifah, P Haas, M Cava, R Larbalestier, D Rzchowski, MS |
| author_facet | Heitmann, T Bu, S Kim, D Choi, J Giencke, J Eom, C Regan, K Rogado, N Hayward, M He, T Slusky, J Khalifah, P Haas, M Cava, R Larbalestier, D Rzchowski, MS |
| author_sort | Heitmann, T |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T02:26:55Z |
| format | Journal article |
| id | oxford-uuid:a5eaf26a-e44d-4922-b04f-affc922343c8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:26:55Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:a5eaf26a-e44d-4922-b04f-affc922343c82022-03-27T02:43:46ZMgB2 energy gap determination by scanning tunnelling spectroscopyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a5eaf26a-e44d-4922-b04f-affc922343c8EnglishSymplectic Elements at Oxford2004Heitmann, TBu, SKim, DChoi, JGiencke, JEom, CRegan, KRogado, NHayward, MHe, TSlusky, JKhalifah, PHaas, MCava, RLarbalestier, DRzchowski, MSWe 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. |
| spellingShingle | Heitmann, T Bu, S Kim, D Choi, J Giencke, J Eom, C Regan, K Rogado, N Hayward, M He, T Slusky, J Khalifah, P Haas, M Cava, R Larbalestier, D Rzchowski, MS MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title | MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title_full | MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title_fullStr | MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title_full_unstemmed | MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title_short | MgB2 energy gap determination by scanning tunnelling spectroscopy |
| title_sort | mgb2 energy gap determination by scanning tunnelling spectroscopy |
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