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

X. G. Qiu; V. V. Moshchalkov; J. Karpinski

doi:10.1103/PhysRevB.62.4119

paper

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

arXiv:cond-mat/0005460 · doi:10.1103/PhysRevB.62.4119

Abstract

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 $_{t o p}$ and V $_{b o t}$ ). 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 $_{b o t}$ 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.

1 Text file, 3 eps figures

References in corpus (1)

Evidence for a Two-stage Melting Transition of the Vortex Matter in Bi2Sr2Ca1Cu2O8+d Single Crystals obtained by Muon Spin Rotation

Vortex melting and decoupling transitions in YBa2​Cu4​O8​ single crystals

Abstract

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