High-Tc superconductivity at the interface between the CaCuO2 and SrTiO3 insulating oxides

Di Castro, D.; Cantoni, C.; Ridolfi, F.; Aruta, C.; Tebano, A.; Yang, N.; Balestrino, G.

doi:10.1103/PhysRevLett.115.147001

Title: High- $T_{c}$ superconductivity at the interface between the ${CaCuO}_{2}$ and ${SrTiO}_{3}$ insulating oxides

Journal Article · Mon Sep 28 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.147001· OSTI ID:1225418

Di Castro, D. ^[1]; Cantoni, C. ^[2]; Ridolfi, F. ^[1]; Aruta, C. ^[1]; Tebano, A. ^[1]; Yang, N. ^[3]; Balestrino, G. ^[1]

Univ. di Roma Tor Vergata, Roma (Italy)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. di Roma Tor Vergata, Roma (Italy); Univ. degli studi Niccolo Cusano, Roma (Italy)

At interfaces between complex oxides it is possible to generate electronic systems with unusual electronic properties, which are not present in the isolated oxides. One important example is the appearance of superconductivity at the interface between insulating oxides, although, until now, with very low T_c. We report the occurrence of high T_c superconductivity in the bilayer CaCuO₂/SrTiO₃, where both the constituent oxides are insulating. In order to obtain a superconducting state, the CaCuO₂/SrTiO₃ interface must be realized between the Ca plane of CaCuO₂ and the TiO₂ plane of SrTiO₃. Only in this case can oxygen ions be incorporated in the interface Ca plane, acting as apical oxygen for Cu and providing holes to the CuO₂ planes. In addition, a detailed hole doping spatial profile can be obtained by scanning transmission electron microscopy and electron-energy-loss spectroscopy at the O K edge, clearly showing that the (super)conductivity is confined to about 1–2 CaCuO₂ unit cells close to the interface with SrTiO₃. The results obtained for the CaCuO₂/SrTiO₃ interface can be extended to multilayered high T_c cuprates, contributing to explaining the dependence of T_c on the number of CuO₂ planes in these systems.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1225418

Alternate ID(s):: OSTI ID: 1222044

Journal Information:: Physical Review Letters, Vol. 115, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors Peng, Y. Y.; Dellea, G.; Minola, M. Nature Physics, Vol. 13, Issue 12 https://doi.org/10.1038/nphys4248	journal	August 2017
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