Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure-induced structural transitions triggering dimensional crossover
  in lithium purple bronze Li0.9M6O17   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 present study 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. While the first pressure-induced
structure of the series is resolved, the identification of the underlying
mechanisms driving the dimensional change in the physics remains a challenge.

19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat