https://doi.org/10.1140/epjb/e2003-00318-9
Temperature dependent local Cu-O displacements from underdoped to overdoped La-Sr-Cu-O superconductor
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
Corresponding author: a saini@romal.infn.it
Received:
9
July
2003
Published online:
19
November
2003
We have studied doping evolution of the temperature dependent local Cu-O
displacements in the La
SrxCuO4 superconductor by
polarized Cu K-edge extended X-ray absorption fine structure (EXAFS)
measurements. While temperature dependent Debye-Waller factor of the
Cu-O bonds, measuring the local Cu-O displacements, shows an anomalous
increase at low temperature for the underdoped single crystals, we do
not find such a dependence for the case of the overdoped system. The
results, which are discussed in the light of recent angle resolved
photoemission measurements, provide an evidence for some important
correlation between the doping dependent electron-lattice interaction,
the charge inhomogeneities and the local Cu-O displacements in the copper
oxide superconductors.
PACS: 74.72.Dn – La-based cuprates / 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc. / 74.81.-g – Inhomogeneous superconductors and superconducting systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
