Growth of CaCuO₂and Sr_xCa_{1 –x}CuO₂epitaxial films on NdGaO₃substrates by pulsed laser deposition

Abstract

High quality epitaxial films of the 'infinite layer' (IL) compound Sr, Ca, -, CuO, (x=O-l) have been grown by pulsed laser deposition on NdGaO, (1 10) substrates, thus including the last member of this series CaCuO,, for the first time, to our knowledge. The quality of films varied with the composition: higher quality films were obtained for x = 0 and 0.1. The experimental results have been explained by taking into account the lattice match between film and substrate: a better match results in a better film quality. A very good match is obtained on NdGaO, substrates for IL films with small or zero Sr content. Attempts to grow IL films were also carried out on SrTiO, and LaAIO, substrates. On SrTiO, substrates it was not possible to grow IL films in the absence of Sr, while on LaAIO, substrates no IL films could be grown at all.In the case of SrTiO,, the lattice match is good only for Sr-rich films, while in the case of LaA103, no good match can be obtained for any composition. Such substrate effects are not unexpected due to the importance of the substrate for the pseudomorphic stabilization of the otherwise unstable IL structure.

Structural ordering and chemical configuration of Ba-based infinite-layer superlattices

“…The deposition techniques and the growth procedure have been described in detail elsewhere. 5 Briefly, a laser beam impinges onto the target surface with an angle of 45°. Different targets ͑BaCuO 2 and CaCuO 2 polycrystalline high-purity disk͒ were mounted on a computercontrolled carousel.…”

High-TcSuperconductivity at the Interface between theCaCuO2andCastro1, Cantoni2, Ridolfi3 et al. 2015Phys. Rev. Lett.

“…The films were deposited on NdO terminated 5x5 mm 2 NdGaO 3 (110) (NGO) oriented mono-crystalline substrates, the most suitable substrates to grow the CCO film [15] and CCO/STO superlattices [10].…”

Dispersion of Magnetic Excitations in the CuprateLa2CuO4andCaCuO2Compounds Measured Using Resonant X-Ray Scattering

“…Besides these spin excitations the RIXS spectra also show, at higher energies, intense dd excitations that are due to the redistribution of electrons within the copper 3d shell [20,21], possibly accompanied by spin-flip excitations as well [22,23]. We used CaCuO2 (CCO) and La2CuO4 (LCO) thin films (100 nm) grown by pulsed laser deposition on (001) LaAlO3 and SrTiO3, respectively [25]. The surface was not treated after insertion in the measurement vacuum chamber as L-RIXS probes hundreds of nm under the surface.…”