Nature of the low-field transition in the mixed state of high-temperature superconductors
Seungoh Ryu, David Stroud
DOI 10.1103/PhysRevB.57.14476 · Physical Review B
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Abstract
We have numerically studied the statics and dynamics of a model three-dimensional (3D) vortex lattice at low magnetic fields. For the statics we use a frustrated 3D XY model on a stacked triangular lattice. We model the dynamics as a coupled network of overdamped resistively shunted Josephson junctions with Langevin noise. At low fields, there is a weakly first-order phase transition, at which the vortex lattice melts into a line liquid. Phase coherence parallel to the field persists until a sharp crossover, conceivably a phase transition, near Tl>Tm which develops at the same temperature as an infinite vortex tangle. The calculated flux flow resistivity in various geometries near T=Tl closely resembles experiment. The local density of field induced vortices increases sharply near Tl, corresponding to the experimentally observed magnetization jump. We discuss the nature of a possible transition or crossover at Tl(B) which is distinct from flux lattice melting.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2SrCa2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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