Nonlinear Conductivity of Geometrically Frustrated Iridate Ca5Ir3O12

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Bibliographic Information

Other Title
  • Nonlinear Conductivity of Geometrically Frustrated Iridate Ca<sub>5</sub>Ir<sub>3</sub>O<sub>12</sub>
Published
2017-12-07
Resource Type
journal article
Rights Information
  • Copyright (c) 2018 The Physical Society of Japan
DOI
  • 10.7566/jpsj.87.013703
Publisher
日本物理学会

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Description

We report the discovery of nonlinear conductivity along the c-axis in a single crystal of Ca5Ir3O12, which indicates a semiconducting behavior with a narrow band gap of ∼0.2 eV. The resistivity decreases with increase in the applied current. This nonlinearity is reversible with the direction of current. We also show the ab initio density functional band structures and the Fermi surface. We found that the spin–orbit interactions result in an appreciable change in the low-energy electronic structure; the interaction splits the metallic bands and leads to a pocket-like band structure, thus reducing the metallic trend. The size of the spin–orbit interaction is estimated as ∼0.3 eV, which is large enough to be comparable to the valence bandwidth of ∼0.5 eV. The Fermi surface exhibits a sheet structure along the c*-axis, due to the 1D chain structure of edge-sharing IrO6.

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