Two Superconducting Transitions in Single Crystal La${}_{2-x}$Ba${}_x$CuO${}_4$

Abstract

We use spatially-resolved transport techniques to investigate the superconducting properties of single crystals La${}_{2-x}$Ba${}_x$CuO${}_4$. We find a new superconducting transition temperature $T_{cs}$ associated with the ab-plane surface region which is considerably higher than the bulk $T_c$. The effect is pronounced in the region of charge carrier doping $x$ with strong spin-charge stripe correlations, reaching $T_{cs}=36$ K or 1.64$T_c$.

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Cited by in corpus (2)

• The nature of the phase transition in the cuprates as revealed by a magnetic field free stiffness meter
• Tuning vortex fluctuations and the resistive transition in superconducting films with a thin overlayer