Doping Dependence of Vortex Regimes in Y$ {1-x}$Pr$ {x}$Ba$ {2}$Cu$ {3}$O$ {7-δ}$ Single Crystals - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: Magnetic relaxation measurements on a series ofY$ {1-x}$Pr$ {x}$Ba$ {2}$Cu$ {3}$O$ {7-\delta}$ $x = 0.13, 0.34, 0.47$ singlecrystals were performed over a large field and temperature range in order toinvestigate the characteristics of the vortex matter across the secondmagnetization peak SMP. The magnitude of the SMP varies non-monotonicallywith the Pr concentration; i.e., the irreversible magnetization normalized byits value at the onset field $H {on}$ displays a maximum for the $x = 0.34$single crystal. The two characteristic fields, $H {on}$ and $H {sp}$, followdifferent temperature $T$ dependences: $H {on} \propto T^{ u {on}}$ and$H {sp} \propto 1-T-T {c}^{2}^{ u {sp}}$. The extracted values of theapparent activation energy $U^\ast$ and the creep exponent $\mu$ display amaximum at a field $H {on} < H^\ast < H {sp}$. Their field dependences pointtoward the coexistence of both elastic and plastic creep for $H > H {on}$. Thedegree of participation of each creep mechanism is determined by the chargecarrier density, which controls both the elastic properties of the vortexmatter and the pinning potential.



Autor: P. Gyawali, V. Sandu, B. J. Taylor, M. B. Maple, C. C. Almasan

Fuente: https://arxiv.org/







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