Two-dimensional vortex fluctuations in the nonlinear current-voltage characteristics for high-temperature superconductors

Henrik Jeldtoft Jensen; Petter Minnhagen

doi:10.1103/PhysRevLett.66.1630

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Two-dimensional vortex fluctuations in the nonlinear current-voltage characteristics for high-temperature superconductors

Henrik Jeldtoft Jensen, Petter Minnhagen

DOI 10.1103/PhysRevLett.66.1630 · Physical Review Letters

T1

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Abstract

The nonlinear current-voltage (I-V) characteristics are discussed in terms of thermally activated vortex-antivortex pairs in the CuO2 planes. The interaction energy of the two vortices in a pair grows linearly with their separation due to the interplane coupling. This linear interaction gives rise to a critical current which decreases linearly with the temperature. The I-V characteristic has the form V∼I(I-Ic)α(T)−1. Comparisons with experiments on Y-Ba-Cu-O are discussed. We suggest that the I-V data in the case of a magnetic field may be associated with a thermal vortex-unbinding transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y2Ba4Cu8O16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown