Commensurate-incommensurate transition in the charge-density-wave state of K/sub 0. 30/MoO/sub 3/
The ''blue bronze'' K/sub 0.30/MoO/sub 3/ 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 delta = 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.
- Research Organization:
- AT and T Bell Laboratories, Murray Hill, New Jersey 07974
- OSTI ID:
- 6108182
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 31:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLYBDATES
ELECTRIC CONDUCTIVITY
POTASSIUM COMPOUNDS
PLASMA WAVES
LOW TEMPERATURE
NEUTRON DIFFRACTION
NONLINEAR PROBLEMS
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
WAVE PROPAGATION
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
ELECTRICAL PROPERTIES
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties