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Surface Contribution to the Superconducting Properties of MgB2 Single Crystals

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arxiv cond-mat/0307445 v1 pith:LRJQWQNF submitted 2003-07-17 cond-mat.supr-con

Surface Contribution to the Superconducting Properties of MgB2 Single Crystals

A. Rydh , U. Welp , J. M. Hiller , A. Koshelev , W. K. Kwok , G. W. Crabtree , K. H. P. Kim , C. U. Jung
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H.-S. Lee B. Kang S.-I. Lee
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classification cond-mat.supr-con
keywords crystalcrystalsmeasurementsmgb2singlesurfacesurfacestransport
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We demonstrate direct evidence of possible surface superconductivity on small, well-shaped MgB2 single crystals. Transport measurements in the range H < 1.6 Hc2^c, where Hc2^c is the bulk upper critical field for the c axis, show non-Ohmic and strongly angular dependent resistivity. Studies of the alignment of H with selected crystal surfaces, transport and specific heat measurements on the same crystal, and a physical sculpturing of the crystal surfaces using a focused ion beam all support the conclusion. Similar, albeit less pronounced results are obtained for fields in the basal plane.

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