High-pressure oxidation of Sr2CuO3+delta With delta<0.1 has produced s
amples with metallic chains as well as those with small-polaron behavi
or. The paramagnetic susceptibility evolves with increasing delta from
a primarily Bonner-Fisher temperature dependence to a Curie-Weiss beh
avior for small-polaron samples and a strongly mass-enhanced Pauli par
amagnetism for the metallic samples. Samples of intermediate oxidation
exhibited a smooth transition from metallic behavior at low temperatu
res to small-polaron behavior at higher temperatures. The small low-te
mperature Seebeck coefficient alpha(T) of the metallic samples exhibit
ed a negative enhancement characterized by a hump at approximately 75
K typical of acoustic-phonon drag; there was no evidence for an alpha(
T) like that of the CuO2 planes of the superconductive cuprates, which
have an enhancement with a T(max)approximate to 140 K that we have as
sociated with vibronic states derived from dynamic pseudo-Jahn-Teller
deformations tions of the Cu sites inside large correlation polarons.
These data support the suggestion that an enhancement with a T(max)app
roximate to 140 K found for the chains in YBa2Cu3O6.96 is the result o
f a strong elastic coupling to the superconductive CuO2 sheets and is
not an intrinsic property of the chains.