Abstract
In order to enlighten the structure of vortex matter in irradiated layered Bi2Sr2CaCu2O8+δ single crystals, the interaction of Josephson vortices and pancake vortices in was investigated by means of the local ac-magnetic permeability measurements by using the miniature local coils, while vortex matter in pristine crystals was studied by in-plane resistivity measurements. The transition anomaly, separating the strong pinning phase and the weak pinning vortex phase was found by both techniques deep in the vortex solid phase solid near ab-plane, indicating crossover from the vortex chains + lattice phase to tilted vortex chains phase. While the columnar defects affect strongly the first-order vortex-lattice melting transition, the magnetic permeability anomaly, associated with the crossover from vortex chains + lattice phase to tilted lattice, is surprisingly still clear, deep in the vortex solid phase. However, the stronger columnar defects eventually affect the crossover anomaly that it disappears too.
Highlights
Vortex matter in layered superconductors, such as Bi2Sr2CaCu2O8+δ single crystals, differs from vortex lattices in moderately anisotropic superconductors, such as YBa2Cu3O7−δ
In this article we report recent measurements of the vortex-solid phase diagram in Bi2Sr2CaCu2O8+δ pristine and irradiate samples and observation of the phase boundary deep in the vortex solid phase which can be attributed to a vortex structure transition
Comparison of the free energies of crossing and tilted vortex lattices result in a complicated picture of phase transitions between these vortex structures
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 667 012007 (http://iopscience.iop.org/1742-6596/667/1/012007) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 158.125.34.47 This content was downloaded on 21/01/2016 at 17:42 Please note that terms and conditions apply
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