Anionic Depolymerization Transition in IrTe2
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- Anionic Depolymerization Transition in IrTe2
- Oh, Yoon Seok; Yang, J. J.; Horibe, Y.; Cheong, S. -W.
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.110, no.12
- Selenium substitution drastically increases the transition temperature of iridium ditelluride (IrTe2) to a diamagnetic superstructure from 278 to 560 K. Transmission electron microscopy experiments revealed that this enhancement is accompanied by the evolution of nonsinusoidal structure modulations from q=1/5(101̄) to q=1/6(101̄) 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 IrTe2 is unique in crystalline inorganic solids.
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