Physics – Condensed Matter – Superconductivity
Scientific paper
2002-03-12
Eur. Phys. J. B 30 (2002) 147
Physics
Condensed Matter
Superconductivity
13 pages, 4 figures, European Physical Journal B in press
Scientific paper
10.1140/epjb/e2002-00369-4
The anisotropy of MgB2 is still under debate: its value, strongly dependent on the sample and on the measuring method, ranges between 1.2 and 13. In this work we present our results on a MgB2 c-oriented superconducting thin film. To evaluate the anisotropy, we followed two different approaches. Firstly, magnetoresistivity was measured as a function of temperature at selected magnetic fields applied both parallel and perpendicular to the c-axis; secondly, we measured magnetoresistivity at selected temperatures and magnetic fields, varying the angle q between the magnetic field and the c-axis. The anisotropy estimated from the ratio between the upper critical fields parallel and perpendicular to the c-axis and the one obtained in the framework of the scaling approach within the anisotropic Ginzburg-Landau theory are different but show a similar trend in the temperature dependence. The obtained results are compared and discussed in the light of the two-band nature of MgB2. A comparison between critical fields in thin films and single crystal is also performed.
Braccini Valeria
Cimberle M. R.
Ferdeghini Carlo
Ferrando V.
Manfrinetti P.
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