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

Journal Article · Mon Jul 06 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4926723· OSTI ID:22483147

Hirai, Daigorou ^[1]; Matsuno, Jobu ^[2]; Nishio-Hamane, Daisuke ^[3]; Takagi, Hidenori ^[1]

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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)

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, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 107; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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