Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site

Hiromichi Kuriyama, Jobu Matsuno, Seiji Niitaka, Masaya Uchida, Daisuke Hashizume, Aiko Nakao, Kunihisa Sugimoto, Hiroyuki Ohsumi, Masaki Takata, Hidenori Takagi

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24 Citations (Scopus)


Single-crystalline thin film of an iridium dioxide polymorph Ir2 O4 has been fabricated by the pulsed laser deposition of Li x Ir2 O4 precursor and the subsequent Li-deintercalation using soft chemistry. Ir2 O4 crystallizes in a spinel (A B2 O4) without A cations in the tetrahedral site, which is isostructural to λ -MnO2. Ir ions form a pyrochlore sublattice, which is known to give rise to a strong geometrical frustration. This Ir spinel was found to be a narrow gap insulator, in remarkable contrast to the metallic ground state of rutile-type IrO2. We argue that an interplay of a strong spin-orbit coupling and a Coulomb repulsion gives rise to an insulating ground state as in a layered perovskite Sr2 IrO4.

Original languageEnglish
Article number182103
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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