Topological Defects in the Flux-Line Lattice and Their Relationship to the Critical Current of a Type-II Superconductor

F. Pardo; F. De La Cruz; P. L. Gammel; C. S. Oglesby; E. Bucher; B. Batlogg; D. J. Bishop

doi:10.1103/PhysRevLett.78.4633

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Topological Defects in the Flux-Line Lattice and Their Relationship to the Critical Current of a Type-II Superconductor

F. Pardo, F. De La Cruz, P. L. Gammel, C. S. Oglesby, E. Bucher, B. Batlogg, D. J. Bishop

DOI 10.1103/PhysRevLett.78.4633 · Physical Review Letters

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Abstract

We report on a detailed magnetic decoration study of the real-space structure of the flux-line lattice (FLL) in NbSe2. We find two types of topological defects with different behaviors as a function of applied current and history. Isolated dislocations anneal with increasing current but peak at the critical current Jc, being related to the microscopic disorder in the sample related to Jc. The density of FLL grain boundaries is independent of current below Jc but drops abruptly at Jc, being the result of FLL nucleation effects and not affecting Jc. We also report on current-induced hexatic order in the FLL.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown