New paper on pressure-induced structural transitions in lithium purple bronze

Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17

At ambient pressure, lithium molybdenum purple bronze (Li0.9Mo6O17) is a quasi-one dimensional solid in which the anisotropic crystal structure and the linear dispersion of the underlying bands produced by electronic correlations possibly bring about a rare experimental realization of Tomomaga-Luttinger liquid physics.

It is also the sole member of the broader purple molybdenum bronzes family where a Peierls instability has not been identified at low temperatures.  The paper of Tran et al reports a pressure-induced series of phase transitions between 0 and 12 GPa. These transitions are strongly reflected in infrared spectroscopy, Raman spectroscopy, and x-ray diffraction. The most dramatic effect seen in optical conductivity is the metallization of the c-axis, concomitant to the decrease of conductivity along the b-axis. This indicates that high pressure drives the material away from its quasi-one dimensional behavior at ambient pressure.

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