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

研究成果: Article査読

25 被引用数 (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.

ジャーナルApplied Physics Letters
出版ステータスPublished - 2010

ASJC Scopus subject areas

  • 物理学および天文学(その他)


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