TY - JOUR
T1 - Local structural displacements across the structural phase transition in IrTe 2
T2 - Order-disorder of dimers and role of Ir-Te correlations
AU - Joseph, B.
AU - Bendele, M.
AU - Simonelli, L.
AU - Maugeri, L.
AU - Pyon, S.
AU - Kudo, K.
AU - Nohara, M.
AU - Mizokawa, T.
AU - Saini, N. L.
PY - 2013/1/31
Y1 - 2013/1/31
N2 - We have studied local structure of IrTe2 by Ir L3-edge extended x-ray absorption fine structure (EXAFS) measurements as a function of temperature to investigate origin of the observed structural phase transition at Ts∼270 K. The EXAFS results show an appearance of longer Ir-Te bond length (ΔR∼0.05 Å) at T<Ts. We have found Ir-Ir dimerization, characterized by distinct Ir-Ir bond lengths (ΔR∼0.13 Å), existing both above and below Ts. The results suggest that the phase transition in IrTe2 should be an order-disorder-like transition of Ir-Ir dimers assisted by Ir-Te bond correlations, thus indicating important role of the interaction between the Ir 5d and Te 5p orbitals in this transition.
AB - We have studied local structure of IrTe2 by Ir L3-edge extended x-ray absorption fine structure (EXAFS) measurements as a function of temperature to investigate origin of the observed structural phase transition at Ts∼270 K. The EXAFS results show an appearance of longer Ir-Te bond length (ΔR∼0.05 Å) at T<Ts. We have found Ir-Ir dimerization, characterized by distinct Ir-Ir bond lengths (ΔR∼0.13 Å), existing both above and below Ts. The results suggest that the phase transition in IrTe2 should be an order-disorder-like transition of Ir-Ir dimers assisted by Ir-Te bond correlations, thus indicating important role of the interaction between the Ir 5d and Te 5p orbitals in this transition.
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U2 - 10.1103/PhysRevB.88.224109
DO - 10.1103/PhysRevB.88.224109
M3 - Article
AN - SCOPUS:84892379861
SN - 0163-1829
VL - 88
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 22
M1 - 224109
ER -