Surface Contribution to the Superconducting Properties of MgB2 Single Crystals

Details Surface Contribution to the Superconducting Properties of MgB2 Single Crystals Surface Contribution to the Superconducting Properties of MgB2 Single Crystals

2003-07-17

arxiv.org/abs/cond-mat/0307445v1

Phys. Rev. B 68, 172502 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.68.172502

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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