PL EN


Preferences help
enabled [disable] Abstract
Number of results
1991 | 80 | 4 | 571-581
Article title

Pseudorotational Averaging of EPR Spectrum of Cu(II)O_{5} Complex in YBa_{2}Cu_{3}O_{7-δ} in Low Temperatures

Content
Title variants
Languages of publication
EN
Abstracts
EN
In low temperatures the condensation of oxygen was found to occur at 05 site in an elementary cell of YBa_{2}Cu_{3}O_{7-δ} being the fifth ligand forming the CuO_{5} complex around Cul copper in chain. This change of coordinantion from CuO_{4} to CuO_{5} is the origin of a pseudorotation related to a strong vibronic coupling of two distorted configurations: a tetragonal pyramid C_{4v} and a trigonal bipyramid D_{3h}, which yields a pseudocubic EPR spectrum in low temperatures. The averaged spectroscopic splitting coefficient is related to a superposition of vibronically coupled orbital states |x^{2} - y^{2}〉 and |3z^{2} - r^{2}〉. The averaged spectrum was for the first time observed in low temperatures since the oxygen condensation in YBa_{2}Cu_{3}O_{7-δ} at 05 site of the chain occur only when oxygen undergoing fast diffusion among the chains, gets localized with decreasing temperature. The activation energy of oxygen desorption from the 05 site is 36 K.
Keywords
EN
Year
Volume
80
Issue
4
Pages
571-581
Physical description
Dates
published
1991-10
received
1991-07-24
References
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv80z408kz
Identifiers
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.