Abstract
The temperature dependence of anisotropy of the phonon and electron Raman scattering components was studied by measurements in the xy plane of a nontwinned YBa2Cu3O7−x single crystal. It is shown that the sign of the orthorhombicity parameter γ=(I yy −I xx )/(I yy +I xx ) for the full-symmetry phonons (150, 340, and 435 cm−1 modes) generated by the displacements of ions in the CuO2 plane is opposite to the sign of this parameter for the phonons generated by the out-of-plane barium and bridging oxygen displacements (120 and 500 cm−1 modes). In the superconducting state, the γ value decreases in the region of low frequencies, but the frequency renormalization of the 340 cm−1 mode measured in the xx and yy spectra is the same to within the experimental error.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 121, No. 2, 2002, pp. 406–411.
Original Russian Text Copyright © 2002 by Misochko.
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Misochko, O.V. Anisotropy of the Raman scattering measured in the xy plane of a nontwinned YBa2Cu3O7−x single crystal. J. Exp. Theor. Phys. 94, 345–349 (2002). https://doi.org/10.1134/1.1458484
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DOI: https://doi.org/10.1134/1.1458484