Melting of regular and decoupled vortex lattices in BSCCO crystals

The angular dependence of the first-order phase transition (FOT) in the vortex lattice in Bi 2Sr 2CaCu 2O 8 crystals was investigated by a low frequency AC shielding technique (with the AC field ‖ c), in which the static-field component parallel to c- ( H ⦜) was varied with the in-plane field H ‖ he...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000, Vol.341, p.1213-1214
Main Authors: Konczykowski, M., van der Beek, C.J., Indenbom, M.V., Zeldov, E.
Format: Article
Language:English
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Summary:The angular dependence of the first-order phase transition (FOT) in the vortex lattice in Bi 2Sr 2CaCu 2O 8 crystals was investigated by a low frequency AC shielding technique (with the AC field ‖ c), in which the static-field component parallel to c- ( H ⦜) was varied with the in-plane field H ‖ held constant. The linear decrease of the FOT field H FOT ⦜ with increasing H ‖ ends at a temperature—dependent critical value of H ‖. A new transition, marked by the abrupt drop of the ab-plane shielding current, appears at this point. We draw a new phase diagram with H ‖ and H ⦜ field components as coordinates; this features at least two distinct regions in the vortex solid phase, that are determined by the different interplay between the pancake vortex— and Josephson vortex lattice.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(00)01110-2