Scaling of vortex lattice melting transition in single crystals of Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+ delta )

The vortex lattice melting transition in single crystals Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+ delta ) was studied by in-plane resistivity measurements in the Corbino geometry in magnetic fields tilted away from the c-axis. In strong contrast to YBa sub(2)Cu sub(3)O sub(7- delta ), the unusual non-e...

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Published in:Physica. C, Superconductivity Superconductivity, 2001-08, Vol.357-360, p.450-453
Main Authors: Mirkovic, J, Savel'ev, S, Sugahara, E, Kadowaki, K
Format: Article
Language:English
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Summary:The vortex lattice melting transition in single crystals Bi sub(2)Sr sub(2)CaCu sub(2)O sub(8+ delta ) was studied by in-plane resistivity measurements in the Corbino geometry in magnetic fields tilted away from the c-axis. In strong contrast to YBa sub(2)Cu sub(3)O sub(7- delta ), the unusual non-elliptic melting transition line in the H super(c)-H super(ab) phase plane is observed. The H super(c)-H super(ab) melting curves measured in a wide temperature range, T < 88 K, collapse into the unique curve if the H super(c) and H super(ab) axes are rescaled by the functions H super(c)/(1-T/T sub(c)) super(1.3) and H super(ab)/(1-T super(2)/T super(2) sub(c)). This means that the effective anisotropy gamma super(eff) of the melting transition increases with temperature. At T approximately 88 K, the anisotropy gamma super(eff) exhibits maximum and tends to decrease close to T sub(c). copyright 2001 Elsevier Science B.V. All rights reserved.
ISSN:0921-4534