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Superconducting energy gap distribution of

$\chem{MgB_2}$

investigated bypoint-contact spectroscopy

Author： Laube F. Goll G. Hagel J. H. v. Löhneysen D. Ernst T. Wolf F.

Publisher： Edp Sciences

E-ISSN： 1286-4854|56|2|296-301

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.56, Iss.2, 2010-03, pp. : 296-301

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

We performed point-contact spectroscopy on the binary superconductorMgB₂. The differential conductance shows gap-related structures whichvary in width and position from contact to contact. The distribution of energy gaps shows a distinctaccumulation around 1.7 and 7 meV which is associated with the occurrence ofa small and a large energy gap in MgB₂. While with increasing Tthe structure in $\upd I/\upd V$ associated with the small gap is present up to $T_\ab{c}$,in magnetic field it is suppressed well below $B_\ab{c2}$.

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