The Effect of Pressure on the Modulated Phases of TTF-TCNQ
A satellite reflection in the hkO zone of TTF-TCNQ has been measured by neutron scattering at pressures up to 0.46 G.Pa. At 10K the a component of the satellite wavevector changes from 0.25a’ to 0.5 aX at a pressure between 0.3 GPa & 0.46 GPa. The satellite is found to disappear continuously at~56K at the latter pressure and to show no signature of the transition observed at 32K by transport measurements. As pressure is applied the charge transfer increases from 0.59 electrons at ambient pressure to 0.616 electrons at 0.46 GPa. Extrapolating linearly, 2/3 electron transfer is expected around 1.7 GPa. This confirms that the first-order transition observed between 1.7 GPa and 2.3 GPa by transport measurements is indeed to a commensurable state.
KeywordsAmbient Pressure Charge Density Wave Pyrolytic Graphite Transport Measurement Satellite Intensity
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