Anisotropy dependence of half-loop-mediated vortex motion in thallium-based superconductors studied by magnetoresistivity

F. Warmont; Ch. Goupil; V. Hardy; Ch. Simon

doi:10.1103/PhysRevB.58.132

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Anisotropy dependence of half-loop-mediated vortex motion in thallium-based superconductors studied by magnetoresistivity

F. Warmont, Ch. Goupil, V. Hardy, Ch. Simon

DOI 10.1103/PhysRevB.58.132 · Physical Review B

T1

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Abstract

By measuring the temperature dependence of the magnetoresistivity, we have studied the activation energy U of two Tl-based superconducting oxides having different electronic anisotropies (Tl-2212, which is very anisotropic, close to Bi-2212, and Tl-1212, the anisotropy of which is about 10). The activation energies are described in terms of movements of half loops of vortices, with a lateral size of about the intervortex spacing a0. Taking into account the field dependence of the elastic coefficients C44 and C66, this activation energy is estimated and compared to the experimental data. The precise magnetic-field dependence of the activation energy in Tl-2212 and Tl-1212 are different. This difference is taken into account in the frame of a single model considering two different regimes according to the anisotropy value.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl0.66Bi0.33Sr2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	unknown