Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 426, Issue -, Pages 230-233Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2005.03.029
Keywords
MgB2; tunnel spectra; break junction; heat capacity
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Controversial tunnel and point-contact experimental data on superconducting gap values in MgB2 are analyzed and interpreted in terms of the spatial inhomogeneity and the proximity effect appropriate to this layered compound. Existing specific heat measurements are explained in the same way. Break-junction tunnel studies of polycrystalline MgB2 samples are carried out and a clear-cut multiplicity of gaps is observed, although the shapes of the I-V characteristics vary substantially. (c) 2005 Published by Elsevier B.V.
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