| Issue |
Europhys. Lett.
Volume 61, Number 4, February 2003
|
|
|---|---|---|
| Page(s) | 527 - 533 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00161-8 | |
| Published online | 01 February 2003 | |
bond length fluctuations in 
x
Texas Materials Institute, ME/MS & E, ETC 9.102,
The University of Texas at Austin 1 University Station, C2201,
Austin, TX 78712, USA
Received:
29
August
2002
Accepted:
4
December
2002
We report a significantly stronger suppression of the phonon
contribution to the thermal conductivity in
x than
can be accounted for by disorder of the 16% atomic vacancies
present in . Since the transition from localized to
itinerant electronic behavior is first order and has been shown
to be characterized by bond length fluctuations in several
transition-metal oxides with the perovskite structure, we propose
that cooperative bond length fluctuations play a
role in similar to the 
bond length
fluctuations in the perovskites. This model is able to account
for the strong suppression of the thermal conductivity, the
existence of a pseudogap confirmed by thermoelectric power, an
anomalously large Debye-Waller factor, the temperature dependence
of the magnetic susceptibility, and the inability to order atomic
vacancies in
.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 71.27.+a – Strongly correlated electron systems; heavy fermions / 72.15.-v – Electronic conduction in metals and alloys
© EDP Sciences, 2003
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