Physics – Condensed Matter – Superconductivity
Scientific paper
2002-09-19
Physics
Condensed Matter
Superconductivity
5 pages, 6 figures, Accepted for publication in Phys.Rev. B
Scientific paper
10.1103/PhysRevB.66.134521
We have performed a magnetic study of a bulk metallic sample of Nb with critical temperature $T_{c}=8.5$ K. Magnetization versus temperature (M {\it vs} T) data obtained for fixed magnetic fields above 1 kOe show a superconducting transition which becomes broader as the field is increased. The data are interpreted in terms of the diamagnetic lowest Landau level (LLL) fluctuation theory. The scaling analysis gives values of the superconducting transition temperature $T_{c}(H)$ consistent with $H_{c2}(T)$% . We search for universal 3D LLL behavior by comparing scaling results for Nb and YBaCuO, but obtain no evidence for universality.
Jr.
Alvarenga A. D.
Doria Mauro M.
Friesen Mark
Gandra F. G.
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