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Non-resonant rf absorption evidence for reentrant melting of vortex lattice in $Bi_2Sr_2CaCu_2O_8$ single crystals

Sudershan, YS and Amit, Rastogi and Bhat, SV and Grover, AK and Yamaguchi, Y and Oka, K and Nishihara, Y (1997) Non-resonant rf absorption evidence for reentrant melting of vortex lattice in $Bi_2Sr_2CaCu_2O_8$ single crystals. In: Physica C: Superconductivity, 282-28 (4). pp. 1975-1976.

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We have studied the magnetic field dependent rf (20 MHz) losses in $Bi_2Sr_2CaCu_2O_8$ single crystals in the low field and high temperature regime. Above $H_C_l$ the dissipation begins to decrease as the field is increased and exhibits a minimum at $H_M>H_C_l$. For $H>H_M$ the loss increases monotonically. We attribute the decrease in loss above $H_C_l$ to the stiffening of the vortex lines due to the attractive electromagnetic interaction between the 2D vortices (that comprise the vortex line at low fields) in adjacent CuO bilayers. The minimum at $H_M_4$ implies that the vortex lines are stiffest and hence represents a transition into vortex solid state from the narrow vortex liquid in the vicinity of $H_Cl$. The increase in loss for $H>H_M$ marks the melting of the vortex lattice and hence a second transition into vortex liquid regime. We discuss our results in the light of recent theory of reentrant melting of the vortex lattice by G. Blatter et al. (Phys. Rev. B 54, 72 (1996)).

Item Type: Journal Article
Publication: Physica C: Superconductivity
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Mar 2007
Last Modified: 19 Sep 2010 04:35
URI: http://eprints.iisc.ac.in/id/eprint/9897

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