Occurrence of a high-temperature superconducting phase in (CaCuO2)n/(SrTiO3)m superlattices

Published on Oct 22, 2012in Physical Review B3.736
· DOI :10.1103/PhysRevB.86.134524
D. Di Castro23
Estimated H-index: 23
M. Salvato15
Estimated H-index: 15
+ 14 AuthorsGiuseppe Balestrino24
Estimated H-index: 24
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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