The coupled electronic-structural modulations of the ligand states in IrTe2 have been studied by x-ray absorption spectroscopy and resonant elastic x-ray scattering (REXS). Distinctive preedge structures are observed at the Te-M4,5 (3d → 5p) absorption edge, indicating the presence of a Te 5p-Ir 5d covalent state near the Fermi level. An enhancement of the REXS signal near the Te 3d → 5p resonance at the Q=(1/5,0,-1/5) superlattice reflection is observed below the structural transition temperature Ts∼280 K. The analysis of the energy-dependent REXS line shape reveals the key role played by the spatial modulation of the covalent Te 5p-Ir 5d bond density in driving the stripelike order in IrTe2, and uncovers its coupling with the charge and/or orbital order at the Ir sites. The similarity between these findings and the charge-ordering phenomenology recently observed in the high-temperature superconducting cuprates suggests that the iridates may harbor similar exotic phases.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2014 8 7|
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