Experimental observation of high field diamagnetic fluctuations in Niobium

Abstract

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.

5 pages, 6 figures, Accepted for publication in Phys.Rev. B

References in corpus (1)

• The Average Kinetic Energy of the Superconducting State

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• Onset of phase correlations in YBa2Cu3O{7-x} as determined from reversible magnetization measurements
• A comparative study of high-field diamagnetic fluctuations in deoxygenated YBa2Cu3O(7-x) and polycrystalline (Bi-Pb)2Sr2Ca3O(10)
• Dimensional crossover in the fluctuation magnetization in YBa_2Cu_3O_{7-x}and its evolution with the content of oxygen