High Tc superconductivity in superlattices of insulating oxides

Details High Tc superconductivity in superlattices of insulating oxides High Tc superconductivity in superlattices of insulating oxides

2011-07-12

arxiv.org/abs/1107.2239v2

Physics

Condensed Matter

Superconductivity

12 pages, 5 figures

Scientific paper

We report the occurrence of superconductivity, with maximum Tc = 40 K, in superlattices (SLs) based on two insulating oxides, namely CaCuO2 and SrTiO3. In these (CaCuO2)n/(SrTiO3)m SLs, the CuO2 planes belong only to CaCuO2 block, which is an antiferromagnetic insulator. Superconductivity, confined within few unit cells at the CaCuO2/SrTiO3 interface, shows up only when the SLs are grown in a highly oxidizing atmosphere, because of extra oxygen ions entering at the interfaces. Evidence is reported that the hole doping of the CuO2 planes is obtained by charge transfer from the interface layers, which act as charge reservoir.

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