| Issue |
Europhys. Lett.
Volume 63, Number 1, July 2003
|
|
|---|---|---|
| Page(s) | 125 - 131 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00487-7 | |
| Published online | 01 June 2003 | |
Different temperature-dependent local displacements in
the underdoped and overdoped
system
1
Unità INFM, Università di Roma “La Sapienza” P. le Aldo Moro 2, 00185 Roma, Italy
2
National Institute for Advanced Industrial Science and Technology 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
Received:
10
October
2002
Accepted:
30
April
2003
K-edge extended X-ray absorption fine-structure
(EXAFS) measurements have been used to study the
temperature-dependent local structure of the underdoped and
overdoped superconducting
x system. The
Debye-Waller factor of the in-plane -
bonds has
been used as an order parameter to measure the local
displacements, revealing an anomalous behavior for the underdoped
case while the overdoped system shows a negligible change as a
function of temperature. The results provide an evidence for a
close relationship between local -
displacements, electron-lattice interaction and charge
inhomogeneity in the copper oxide superconductors.
PACS: 74.72.Dn – La-based cuprates / 74.80.-g – Spatially inhomogeneous structures / 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc
© EDP Sciences, 2003
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