Lowest Landau level diamagnetic fluctuations in niobium

• DOI: 10.1016/j.physc.2004.06.010
• Publication Date: 2004-07-21T14:22:43Z
• Authors: Said Salem-Sugui; M. Friesen; A.D. Alvarenga; Osvaldo F. Schilling; F.G. Gandra; M.M. Doria
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

Abstract We have performed a magnetic study of a bulk metallic sample of Nb with critical temperature T c = 8.5 K. Magnetization measurements taken for magnetic fields greater than 1 kOe show a superconducting transition that becomes broader as the field is increased. The data are well described by lowest Landau level (LLL) fluctuation theory. A scaling analysis yields values for the superconducting transition temperature under field T c ( H ) which are consistent with H c2 ( T ).