Upper critical fields of MgB2 thin films

Details Upper critical fields of MgB2 thin films Upper critical fields of MgB2 thin films

2003-04-22

arxiv.org/abs/cond-mat/0304478v1

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures, submitted to Physica C (M2S-Rio proceedings)

Scientific paper

10.1016/j.physc.2004.02.059

Critical fields of four MgB2 thin films with a normal state resistivity ranging from 5 to 50 mWcm and Tc from 29.5 to 38.8 K were measured up to 28 T. Hc2(T) curves present a linear behavior towards low temperatures. Very high critical field values have been found, up to 24 T along the c-axis and 57 T in the basal plane not depending on the normal state resistivity values. In this paper, critical fields will be analyzed taking into account the multiband nature of MgB2; we will show that resistivity and upper critical fields can be ascribed to different scattering mechanisms.

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