CNR-SPIN and University of Tor Vergata | Dipartimento di Ingegneria Civile e Ingegneria Informatica | Via Politecnico 1, I-00133 Roma

Superconductivity in CaCuO₂/SrTiO₃: superlattices by design

Superconductivity was found in CaCuO₂/SrTiO₃ superlattices grown under strongly oxidizing conditions with a maximum Tc of about 40K. The role of the extra oxygen at the interfaces, which thus act as charge reservoir for the CCO block, was envisaged by the presence of Cu 3d(e_g) holes with out-of-plane orbital symmetry, observed by x-ray absorption spectroscopy measurements.
     Di Castro et al. Phys. Rev. B 86, 134524 (2012)



Room-Temperature Giant Persistent Photoconductivity in SrTiO₃/LaAlO₃ Heterostructures

SrTiO₃/LaAlO₃ interfaces show an unprecedented photoconductivity effect that is persistent even at room temperature and giant as it gives rise to a conductivity increase of about 5 orders of magnitude at room temperature. The persistent photoconductivity effects play a paramount role in the still controversial intrinsic behavior of the SrTiO₃/LaAlO₃ interfaces.
     A. Tebano et al. ASC Nano 6, 1278 (2012)

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