Vortex melting and decoupling transitions inYBa2Cu4O8single crystals

2000/05/26 by X. G. Qiu, XG Qiu, V. V. Moshchalkov +2 · 1 citation
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.62.4119

1 Text file, 3 eps figures

arxiv created 2000/05/26 · openalex publication_date 2000/08/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The vortex correlation along the c axis in high quality single crystals of YBa₂Cu₄O₈ has been investigated as a function of temperature T in different magnetic fields, using the flux transformer configuration. A simultaneous sharp drop associated with the vortex lattice melting is observed in both the primary and secondary voltages (V_top and V_bot). Just above the melting temperature, the vortices form three-dimensional line liquid with the correlation length along the c direction L_c<~t, the sample thickness. The temperature where a resistive peak in R_bot develops corresponds to the decoupling temperature T_d at which the vortices lose their correlation along the c direction and they dissolve into the two-dimensional pancake vortices. The H\ensuremath-T phase diagram for the YBa₂Cu₄O₈ single crystal is obtained.

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• Quasiparticle excitation in and around the vortex core of underdopedYBa2Cu4O8studied by site-selective NMR