X-ray diffraction study of ion thermal vibrations in R2CuO4 (R=Pr and Gd) crystals |
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| Authors: | A A Levin Yu I Smolin Yu F Shepelev E I Golovenchits V A Sanina |
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| Institution: | (1) Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, ul. Odoevskogo 24/2, St. Petersburg, 199155, Russia;(2) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia |
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| Abstract: | An X-ray diffraction study is reported of the symmetry in the spatial distribution of thermal vibrations of Cu2+, Gd3+, and Pr3+ ions in Gd2CuO4 crystals. An analysis of the pattern of the angular thermal-vibration amplitude distribution obtained experimentally at different temperatures allows a conclusion about the character of the local Jahn-Teller effect for the Cu2+ ions, structural phase transitions, and the orbital ground state of the Cu2+ ions. |
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