Aw. Mcconnell et al., Polarized reflectance measurements of the CDW transitions in eta-Mo4O11 and gamma-Mo4O11, PHYS REV B, 58(20), 1998, pp. 13565-13573
Temperature;dependent (300-10 K) reflectance measurements were made on eta-
Mo4O11 and gamma-Mo4O11 in the conducting b-c plane in the frequency range
30-8000 cm(-1), for light polarized both parallel and perpendicular to the
charge density wave (CDW) direction (b axis). The optical conductivity was
determined from a Kramers-Kronig analysis of the reflectance. The data clea
rly show strong suppression of the conductivity in the c-axis direction bel
ow the CDW transition temperatures, leading to a partial optical gap in the
spectrum. The b-axis conductivity does not show as strong a suppression ex
cept at low frequencies. The CDW gap energies for both crystals are evaluat
ed, in agreement with those obtained from transport data. The data are cons
idered in light of recent work on stripes and charge ordering in the field
of superconductivity. [S0163-1824(98)05644-6].