Crossover from three- to two-dimensional behavior of the vortex energies in layered XY models for high-Tc superconductors

Hans Weber; Henrik Jeldtoft Jensen

doi:10.1103/PhysRevB.44.454

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Crossover from three- to two-dimensional behavior of the vortex energies in layered XY models for high-Tc superconductors

Hans Weber, Henrik Jeldtoft Jensen

DOI 10.1103/PhysRevB.44.454 · Physical Review B

T1

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Abstract

We use Monte Carlo simulations of a layered XY model to study phase fluctuations in high-Tc superconductors. A vortex-antivortex interaction dominated by a term linear in the vortex separation is found in the low-temperature regime. This is in agreement with a zero-temperature variational calculation. At temperature just above the two-dimensional (2D) vortex-unbinding temperature, the linear term vanishes and an ordinary 2D vortex behavior is found. This explains the finding that high-Tc superconductors show 2D properties in the vortex fluctuations responsible for the resistivity transition close to the critical temperature.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown