TY  - JOUR
AU  - Menushenkov, Alexey
AU  - Kuznetsov, A. V.
AU  - Chernikov, Roman
AU  - Ivanov, Artem
AU  - Sidorov, Vladimir
AU  - Klementiev, Konstantin
TI  - Low Temperature Anharmonicity and Superconductivity in Cuprates
JO  - Journal of superconductivity and novel magnetism
VL  - 27
IS  - 4
SN  - 1557-1947
CY  - New York, NY
PB  - Springer
M1  - PUBDB-2015-01172
SP  - 925 - 928
PY  - 2014
N1  - (c) Springer Science+Business Media New York. Post referee full text in progress.
AB  - Temperature-dependent X-ray absorption spectra of the hole-doped La<sub>2−x</sub>Sr<sub>x</sub> CuO<sub>4</sub> and electron-doped Nd<sub>2−x</sub> Ce <sub>x</sub> CuO<sub>4−δ</sub> high-temperature superconductors were investigated above the Cu K absorption edge. We observed strong anharmonicity in the superconductive CuO<sub>2</sub> plane. For x=0.15 it was shown that part of oxygen ions oscillate in a double-well potential and their vibrations are correlated with the local electron (hole) pair transfer. We suppose that at a low temperature the phase coherence of the local pair movement is determined by the peculiarities of the perovskite-like structure which includes the stiff CuO<sub>n</sub> (n = 4,6) complexes combined by collective rotational and breathing modes.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000333209600007
DO  - DOI:10.1007/s10948-013-2411-1
UR  - https://bib-pubdb1.desy.de/record/207188
ER  -