Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site

Details Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site

2010-05-17

arxiv.org/abs/1005.2926v1

Appl. Phys. Lett. 96, 182103 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 3 figures

Scientific paper

10.1063/1.3374449

Single-crystalline thin film of an iridium dioxide polymorph Ir2O4 has been fabricated by the pulsed laser deposition of LixIr2O4 precursor and the subsequent Li-deintercalation using soft chemistry. Ir2O4 crystallizes in a spinel (AB2O4) without A cations in the tetrahedral site, which is isostructural to lambda-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 strong spin-orbit coupling and a Coulomb repulsion gives rise to an insulating ground state as in a layered perovskite Sr2IrO4.

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