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Abstract
In this work, we perform a systematic study of the lattice dynamics of IrTe using temperature dependence of X-ray diffraction experiment. It is found that the lattice structural symmetry of IrTe
changes from trigonal (space group
) into monoclinic (
) below the phase transition temperature (
). Remarkably, experimental results show that the trigonal cell still insists below
, which coexists intrinsically with the monoclinic cell. After the phase transition, the proportion of the monoclinic cell almost remains unchanged. The structure phase transition temperatures determined from cooling and warming are
240 K and
265 K, respectively. Moreover, the superlattice phase is found with
13.5
, which is suggested to be caused by the destabilization of polymeric Te–Te bonds.
Acknowledgments
This work was supported by the National Natural Science Foundation of China [grant numbers 11004196, U1332140, 11204312, 11174262, 11174290 and U1232142], and the State Key Project of Fundamental Research of China [grant numbers 2010CB923403 and 2011CBA00111].