Upper critical field as a probe for multiband superconductivity in bulk and interfacial STO

Abstract

We investigate the temperature dependence of the upper critical field $H_{c2}$ as a tool to probe the possible presence of multiband superconductivity at the interface of LAO/STO. The behaviour of $H_{c2}$ can clearly indicate two-band superconductivity through its nontrivial temperature dependence. For the disorder scattering dominated two-dimensional LAO/STO interface we find a characteristic non-monotonic curvature of the $H_{c2}(T)$. We also analyse the $H_{c2}$ for multiband bulk STO and find similar behaviour.

17 pages, 10 figures

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• Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells
• Ferroelectricity-induced multiorbital odd-frequency superconductivity in SrTiO${}_3$
• Magnetic behaviour of dirty multiband superconductors near the upper critical field
• Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity
• Two-gap superconductivity in the noncentrosymmetric La${}_3$Se${}_4$ compound
• High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry