skip to main content

SciTech ConnectSciTech Connect

Title: Semimetallic transport properties of epitaxially stabilized perovskite CaIrO{sub 3} films

We report on the synthesis and transport properties of perovskite (Pv) CaIrO{sub 3} thin films. The Pv phase of CaIrO{sub 3} was stabilized by epitaxial growth on SrTiO{sub 3}, (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}AlTaO{sub 6}){sub 0.7}, and LaAlO{sub 3} substrates with strong tensile, weak tensile, and compressive strains, respectively. The resistivity of these films showed a poorly metallic behavior. The Hall resistivity exhibited a sign change as a function of temperature and a nonlinear magnetic-field dependence, which clearly indicated the coexistence of electrons and holes and hence supported that Pv CaIrO{sub 3} films are semimetallic. The observed robustness of the semimetallic ground state against tensile and compressive strains is consistent with the presence of symmetry-protected Dirac points (nodes) around the Fermi level that prohibits the system from becoming a band insulator.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033 (Japan)
  2. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198 (Japan)
  3. Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581 (Japan)
  4. (Germany)
Publication Date:
OSTI Identifier:
22483147
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINATES; EPITAXY; FERMI LEVEL; GROUND STATES; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; NONLINEAR PROBLEMS; PEROVSKITE; STRAINS; STRONTIUM TITANATES; SUBSTRATES; SYNTHESIS; TEMPERATURE DEPENDENCE; THIN FILMS