Renormalized interactions and dissociation of vortices in layered superconductors

Stefan Scheidl; Gregor Hackenbroich

doi:10.1103/PhysRevB.46.14010

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Renormalized interactions and dissociation of vortices in layered superconductors

Stefan Scheidl, Gregor Hackenbroich

DOI 10.1103/PhysRevB.46.14010 · Physical Review B

T1

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Abstract

In layered superconductors, thermal fluctuations excite vortex-antivortex pairs within the layers and thereby renormalize the interactions of the vortices. This leads to a modification of the temperatures, at which vortex-antivortex pairs and single flux lines dissociate. We calculate the renormalized interactions in a self-consistent linear response approach. As a direct consequence of flux quantization, vortex-antivortex pairs and flux lines dissociate at the same temperature. We derive the fugacity-versus-temperature phase diagram of the dissociation process for vanishing external magnetic field. An analysis of the phase diagram with experimental data of Bi-type high-Tc superconductors reveals that the renormalization significantly affects the determination of the magnetic penetration depth from resistivity measurements.

Source-reported materials — not catalogue approval

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