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 Hc 2 as a tool to probe the possible presence of multiband superconductivity at the interface of LAO/STO. The behaviour of Hc 2 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 Hc 2 (T) . We also analyse the Hc 2 for multiband bulk STO and find similar behaviour.
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