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Break-Junction Tunneling on MgB_2 | | H. Schmidt
; J. F. Zasadzinski
; K. E. Gray
; D. G. Hinks
; | | Date: |
18 Sep 2002 | | Journal: | Physica C 385 (2003) 221-232 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Tunneling data on magnesium diboride, MgB_2, are reviewed with a particular focus on superconductor-insulator-superconductor (SIS) junctions formed by a break-junction method. The collective tunneling literature reveals two distinct energy scales, a large gap, Delta_L~7.2 meV, close to the expected BCS value, and a small gap, Delta_S~2.4 meV. The SIS break junctions show clearly that the small gap closes near the bulk critical temperature, T_c=39 K. The SIS spectra allow proximity effects to be ruled out as the cause for the small gap and therefore make a strong case that MgB_2 is a coupled, two-band superconductor. While the break junctions sometimes reveal parallel contributions to the conductance from both bands, it is more often found that Delta_S dominates the spectra. In these cases, a subtle feature is observed near Delta_S+Delta_L that is reminiscent of strong-coupling effects. This feature is consistent with quasiparticle scattering contributions to the interband coupling which provides an important insight into the nature of two-band superconductivity in MgB_2. | | Source: | arXiv, cond-mat/0209447 | | Services: | Forum | Review | PDF | Favorites | |
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