Spin dynamics and structural phase transitions in quasi-2D antiferromagnets R2CuO4 (R=Pr, Sm, and Eu) |
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Authors: | E I Golovenchits V A Sanina |
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Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia |
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Abstract: | Spin and lattice dynamics of R2CuO4 (R=Pr, Sm, and Eu) crystals were studied over the frequency and temperature ranges 20–250 GHz and 5–350 K, respectively. The absorption coefficients of the R2CuO4 crystals (R=Pr, Sm, and Eu) were found to change dramatically at temperatures of, respectively, 20, 80, and 150 K over a broad frequency range above 120 GHz. The absorption jumps were caused by the structural phase transitions. Broad spin-wave bands were observed in the high-temperature phases of all crystals studied. Absorption lines due to lattice dynamics were observed near the temperatures of structural phase transition over a broad frequency range, including the frequencies corresponding to the spin-wave bands. |
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