Volume 59, Number 2, July 2002
|Page(s)||272 - 276|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 July 2002|
Evidence for two-dimensional nucleation of superconductivity in
Institut für Physik,
Universität Augsburg 86159 Augsburg, Germany
2 Institute of Applied Physics - 2028 Kishinev, Moldova
3 Kazan State University - 420008 Kazan, Russia
4 Institute of Solid State Physics - 142432 Chernogolovka, Russia
Accepted: 23 April 2002
According to the crystal structure of and band structure calculations quasi–two-dimensional (2D) boron planes are responsible for the superconductivity. We report on critical fields and resistance measurements of 30 thick films grown on single crystalline substrate. A linear temperature dependence of the parallel and perpendicular upper critical fields indicates a 3D-like penetration of magnetic field into the sample. Resistivity measurements, in contrast, yield a temperature dependence of fluctuation conductivity above which agrees with the Aslamazov-Larkin theory of fluctuations in 2D superconductors. We consider this finding as an experimental evidence of two-dimensional nucleation of superconductivity in .
PACS: 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition / 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.) / 74.76.-w – Superconducting films
© EDP Sciences, 2002
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