Vortex-antivortex interaction in high-Tc superconductors

C. Timm; J. Appel

doi:10.1103/PhysRevB.49.1218

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Vortex-antivortex interaction in high-Tc superconductors

C. Timm, J. Appel

DOI 10.1103/PhysRevB.49.1218 · Physical Review B

T1

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Abstract

The free energy of a vortex-antivortex pair in a Josephson-coupled layered superconductor is derived within the framework of the Lawrence-Doniach theory. We find that the free energy of large pairs depends linearly on the pair separation and that there is no logarithmic term in the free energy for large pairs. We also derive the free energy of a pair of vortex lines, i.e., a vortex-antivortex pair in every layer. It is found that the free energy of this system corresponds to the usual result for conventional superconductors. In conclusion we discuss that the vortex-antivortex interaction cannot be described by a simple modification of the Kosterlitz-Thouless theory.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown