Influence of point defects on the vortex state of disordered superconductors

A. K. Pradhan; M. Muralidhar; Y. Feng; M. Murakami; K. Nakao; N. Koshizuka

doi:10.1103/physrevb.64.172505

Influence of point defects on the vortex state of disordered superconductors

A. K. Pradhan, M. Muralidhar, Y. Feng, M. Murakami, K. Nakao, N. Koshizuka

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We report on a strongly pinned entangled vortex liquid state in the presence of random point disorders in complex ternary (Nd-Eu-Gd)Ba₂Cu₃O_7-δ twinned single-domain melt-textured samples. The in-plane and out-of-plane resistance measurements show that vortex lines are correlated along the c axis with finite vortex correlation length in the pinned liquid state. This is due to the correlated pinning promoted by the twin boundary. The vortex correlation length can be quenched by increasing the defect density by introducing more second-phase precipitates or oxygen defects favoring an entangled vortex liquid state depending on the defect density.

Original language	English
Article number	172505
Pages (from-to)	1725051-1725054
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	17
DOIs	https://doi.org/10.1103/physrevb.64.172505
Publication status	Published - 2001 Nov 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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AU - Pradhan, A. K.

AU - Muralidhar, M.

AU - Feng, Y.

AU - Murakami, M.

AU - Nakao, K.

AU - Koshizuka, N.

PY - 2001/11/1

Y1 - 2001/11/1

N2 - We report on a strongly pinned entangled vortex liquid state in the presence of random point disorders in complex ternary (Nd-Eu-Gd)Ba2Cu3O7-δ twinned single-domain melt-textured samples. The in-plane and out-of-plane resistance measurements show that vortex lines are correlated along the c axis with finite vortex correlation length in the pinned liquid state. This is due to the correlated pinning promoted by the twin boundary. The vortex correlation length can be quenched by increasing the defect density by introducing more second-phase precipitates or oxygen defects favoring an entangled vortex liquid state depending on the defect density.

AB - We report on a strongly pinned entangled vortex liquid state in the presence of random point disorders in complex ternary (Nd-Eu-Gd)Ba2Cu3O7-δ twinned single-domain melt-textured samples. The in-plane and out-of-plane resistance measurements show that vortex lines are correlated along the c axis with finite vortex correlation length in the pinned liquid state. This is due to the correlated pinning promoted by the twin boundary. The vortex correlation length can be quenched by increasing the defect density by introducing more second-phase precipitates or oxygen defects favoring an entangled vortex liquid state depending on the defect density.

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Influence of point defects on the vortex state of disordered superconductors

Abstract

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