Commensurate-incommensurate transition in the charge-density-wave state of K0.30MoO3

R. M. Fleming, Lynn Schneemeyer, D. E. Moncton

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Abstract

The blue bronze K0.30MoO3 has a charge-density wave (CDW) which forms at T=181 K. At temperatures below 181 K, nonlinear conductivity due to charge transport by the CDW has been observed. We have performed x-ray and elastic-neutron-scattering experiments which show that at onset the CDW is incommensurate with a reduced wave vector of q=(0, 0.263, 0.5). The b* component of q is temperature dependent and the incommensurability =q-b*/4 decreases to zero near T=100 K. Measurements of the threshold electric field for nonlinear charge transport show a broad decrease as the temperature is lowered beginning near 100 K. No increase of the threshold field in the commensurate CDW phase is inconsistent with the depinning of a rigid CDW, but may be explained by the transport of CDW phase solitons or dislocations.

Original languageEnglish
Pages (from-to)899-903
Number of pages5
JournalPhysical Review B
Volume31
Issue number2
DOIs
StatePublished - 1 Jan 1985

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