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Comparison Of Small-Field Behaviour In Mgb2, Low And High Temperature Superconductors, Alexey V. Pan, S X. Dou

Australian Institute for Innovative Materials - Papers

Different types of superconductors have been investigated at small magnetic fields (B_a) over wide temperature (T) ranges at different B_a orientations. It has been shown that the temperature dependence of the characteristic field (B*), separating the B_a-independent critical current density (J_c) plateau (single vortex pinning regime) and the region with J_c(B_a) (collective pinning), can be attributed either to the temperature dependence of the magnetic penetration depth for Nb-film and MgB₂bulk superconductors, or to thermally activated processes for Bi-based superconductors and YBa₂Cu₃O_7−δ superconducting …