Thursday, March 21, 2013

1303.4772 (Yoon Seok Oh et al.)

Anionic depolymerization transition in IrTe2    [PDF]

Yoon Seok Oh, J. J. Yang, Y. Horibe, S. -W. Cheong
Selenium (Se) substitution drastically increases the transition temperature of iridium ditelluride (IrTe$_{2}$) to a diamagnetic superstructure from 278 K to 560 K. Transmission electron microscopy experiments revealed that this enhancement is accompanied by the evolution of non-sinusoidal structure modulations from $q = 1/5(10\bar{1})$- to $q = 1/6(10\bar{1})$-types. These comprehensive results are consistent with the concept of the destabilization of polymeric Te-Te bonds at the transition, the temperature of which is increased by chemical and hydrostatic pressure and by the substitution of Te with the more electronegative Se. This temperature-induced depolymerization transition in IrTe$_{2}$ is unique in crystalline inorganic solids.
View original: http://arxiv.org/abs/1303.4772

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