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Dimerization-Induced Cross-Layer Quasi-Two-Dimensionality in Metallic Iridate IrTe2

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arxiv 1309.3548 v1 pith:KWDYWMYE submitted 2013-09-13 cond-mat.str-el cond-mat.mtrl-sci

Dimerization-Induced Cross-Layer Quasi-Two-Dimensionality in Metallic Iridate IrTe2

G.L. Pascut , K. Haule , M.J. Gutmann , S.A. Barnett , A. Bombardi , S. Artyukhin , D. Vanderbilt , J.J. Yang
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S.-W. Cheong V. Kiryukhin
This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords chargecrystaldimerselectronicirte2planesstructurebonding
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The crystal structure of layered metal IrTe2 is determined using single-crystal x-ray diffraction. At T=220 K, it exhibits Ir and Te dimers forming a valence-bond crystal. Electronic structure calculations reveal an intriguing quasi-two-dimensional electronic state, with planes of reduced density of states cutting diagonally through the Ir and Te layers. These planes are formed by the Ir and Te dimers, which exhibit a signature of covalent bonding character development. Evidence for significant charge disproportionation among the dimerized and non-dimerized Ir (charge order) is also presented.

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