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

D. Di Castro; M. Salvato; A. Tebano; D. Innocenti; C. Aruta; W. Prellier; O. I. Lebedev; I. Ottaviani; N. B. Brookes; M. Minola; M. Moretti Sala; C. Mazzoli; P. G. Medaglia; G. Ghiringhelli; L. Braicovich; M. Cirillo; G. Balestrino

doi:10.1103/PhysRevB.86.134524

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

D. Di Castro, M. Salvato, A. Tebano, D. Innocenti, C. Aruta, W. Prellier, O. I. Lebedev, I. Ottaviani, N. B. Brookes, M. Minola, M. Moretti Sala, C. Mazzoli, P. G. Medaglia, G. Ghiringhelli, L. Braicovich, M. Cirillo, G. Balestrino

DOI 10.1103/PhysRevB.86.134524 · Physical Review B

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Abstract

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 a 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. The hole doping is obtained by charge transfer from the interface layers, which thus act as charge reservoir.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(CaCuO2)n/(SrTiO3)m Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	zero_resistance
(CaCuO2)3/(SrTiO3)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	onset