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- Title
Spin Dynamics and Structural Phase Transitions in Quasi-2D Antiferromagnets R[sub 2]CuO[sub 4] (R = Pr, Sm, and Eu).
- Authors
Golovenchits, E. I.; Sanina, V. A.
- Abstract
Spin and lattice dynamics of R[sub 2]CuO[sub 4] (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 R[sub 2]CuO[sub 4] 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. © 2001 MAIK “Nauka / Interperiodica”.
- Subjects
CRYSTALS; LATTICE dynamics; CRYSTAL lattices
- Publication
JETP Letters, 2001, Vol 74, Issue 1, p20
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1402199