Semimetallic transport properties of epitaxially stabilized perovskite CaIrO{sub 3} films
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033 (Japan)
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198 (Japan)
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581 (Japan)
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.
- OSTI ID:
- 22483147
- Journal Information:
- Applied Physics Letters, Vol. 107, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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