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

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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 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(NdEuGd)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93.5	Pressure not reported	unknown
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown