Vortex melting and decoupling transitions in YBa$_{2}$Cu$_{4}$O$_{8}$ single crystals

Details Vortex melting and decoupling transitions in YBa$_{2}$Cu$_{4}$O$_{8}$ single crystals Vortex melting and decoupling transitions in YBa$_{2}$Cu$_{4}$O$_{8}$ single crystals

2000-05-26

arxiv.org/abs/cond-mat/0005460v1

Physics

Condensed Matter

Superconductivity

1 Text file, 3 eps figures

Scientific paper

10.1103/PhysRevB.62.4119

The vortex correlation along the c-axis in high quality single crystals of YBa$_{2}$Cu$_{4}$O$_{8}$ has been investigated as a function of temperature T in different magnetic fields, using the quasi-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}\leq $ 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 loose their correlation along the c-direction and they dissolve into the two dimensional pancake vortices. The H-T phase diagram for the YBa$_{2}$Cu$_{4}$O$_{8}$ single crystal is obtained.

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