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Vortex-lattice melting, phase slips, and decoupling studied by microwave dissipation in Bi2Sr2CaCu2O8+δ

par Enríquez, Hanna B.;De Wilde, Yannick ;Bontemps, Nicole;Tamegai, Tsuyoshi
Référence Physical review. B, Condensed matter, 58, 22, page (745-748)
Publication Publié, 1998-12-01

Article révisé par les pairs

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Résumé :

We have measured the microwave dissipation at 10 GHz in a Bi2Sr2CaCu2O8+delta single crystal, between 75 and 50 K, as a function of the static magnetic field applied parallel to the c axis. We observe a clear-cut onset in the dissipation precisely at the melting field. In the liquid phase, for fields ~1-2 kG, the in-plane and the c axis resistivities deduced from microwave absorption display a different temperature behavior, in contrast with dc measurements. Our c-axis high-frequency data and the dc results can be reconciled by including phase slips due to the motion of pancake vortices, as suggested by Koshelev. The microscopic origin of the c-axis dissipation is thus identified through its frequency dependence.