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Phys Rev Lett. 2012 Mar 16;108(11):116402. Epub 2012 Mar 13.

Charge-orbital density wave and superconductivity in the strong spin-orbit coupled IrTe2:Pd.

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1
Laboratory for Pohang Emergent Materials, Pohang University of Science and Technology, Pohang, Korea.

Abstract

Using transmission electron microscopy, the anomalies in resistivity and magnetic susceptibility at ~262 K in IrTe2 are found to accompany the superlattice peaks with q[over q=(1/5,0,-1/5). The wave vector is consistent with our theoretical calculation for the Fermi surface nesting vector, indicating that the ~262 K transition is of the charge-orbital density wave (DW) type. We also discovered that both Pd intercalation and substitution induce bulk superconductivity with T(c) up to ~3 K, which competes with DW in a quantum critical pointlike manner.

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