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Title: Persistent semi-metal-like nature of epitaxial perovskite CaIrO{sub 3} thin films

Strong spin-orbit coupled 5d transition metal based ABO{sub 3} oxides, especially iridates, allow tuning parameters in the phase diagram and may demonstrate important functionalities, for example, by means of strain effects and symmetry-breaking, because of the interplay between the Coulomb interactions and strong spin-orbit coupling. Here, we have epitaxially stabilized high quality thin films of perovskite (Pv) CaIrO{sub 3}. Film on the best lattice-matched substrate shows semi-metal-like characteristics. Intriguingly, imposing tensile or compressive strain on the film by altering the underlying lattice-mismatched substrates still maintains semi-metallicity with minute modification of the effective correlation as tensile (compressive) strain results in tiny increases (decreases) of the electronic bandwidth. In addition, magnetoresistance remains positive with a quadratic field dependence. This persistent semi-metal-like nature of Pv-CaIrO{sub 3} thin films with minute changes in the effective correlation by strain may provide new wisdom into strong spin-orbit coupled 5d based oxide physics.
Authors:
;  [1]
  1. Department of Physics, POSTECH, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22410232
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; CORRELATIONS; COULOMB FIELD; CRYSTAL DEFECTS; EPITAXY; IRIDIUM OXIDES; L-S COUPLING; MAGNETORESISTANCE; METALLICITY; PHASE DIAGRAMS; STRAINS; SUBSTRATES; SYMMETRY BREAKING; TENSILE PROPERTIES; THIN FILMS