Simulation of vortex matter two-step melting in an anisotropic superconductor with columnar defects

Viana, Leonardo P.; Raposo, Ernesto P.; Coutinho‐Filho, M. D.

doi:10.1016/j.physc.2005.12.044

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…We consider that the flux lines in a layered superconductor is an array of point-like pancake vortices bound together by an interlayer Josephson interaction [48,46,47,98].…”

Section: Modeling Bscco With Columnar Defectsmentioning

confidence: 99%

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Monte Carlo simulation of the crossover from Bose glass to Bragg glass phase in layered BSCCO with columnar defects

Queiroz¹,

Coutinho‐Filho²

2017

J. Stat. Mech.

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Monte Carlo simulations of layered BSCCO samples are used to investigate the behavior of vortex matter at low fields, particularly in connection with the possible occurrence of a Bragg glass (BrG) phase at low density of columnar defects, a phenomenon characterized by the prevalence of short-range over long-range order. In this dislocation-free topological phase the translational order correlation function displays a power law decay. For magnetic induction B = 0.1 kG the analysis of the data for the first Bragg peak of the planar structure factor, the hexatic order parameter, and the Delaunay triangulation shows that, as the density of columnar defects is lowered, a crossover (or transition) from Bose glass to BrG phase takes place in this highly anisotropic high-Tc superconductor. Most importantly, an analysis of the low-temperature 3D vortex-vortex correlation function in terms of the structure factor, calculated via a saddle point approach and the use of the numerical data as input, provides clear-cut evidence of the power law decay of the divergent Bragg peaks in the BrG phase, a fundamental feature that was inequivocally verified only in isotropic compounds.

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“…We consider that the flux lines in a layered superconductor is an array of point-like pancake vortices bound together by an interlayer Josephson interaction [48,46,47,98].…”

Section: Modeling Bscco With Columnar Defectsmentioning

confidence: 99%

“…We use the Lawrence-Doniach model, in which the system is represented by a stack of superconducting planes. Each plane has a certain number of interacting vortices, whose free energy is given by [48,46,47,98]…”

Section: Modeling Bscco With Columnar Defectsmentioning

confidence: 99%