Abstract:The reversible magnetization in Bi 2 Sr 2 CaCu 2 O 8ϩ␦ is analyzed within existing theoretical models. The field-induced suppression of the empirical ''superfluid density'' dM /d(lnH) are compared for the fluctuation mechanism and for the suppression of the order parameter in the vortex core. The thermal fluctuation term is found to be essentially reduced compared to the theoretical prediction for decoupled pancake vortices. We suggest that the energy of Josephson and magnetic coupling between two-dimensional … Show more
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