Abstract
The interaction of weakly nonequilibrium phonons with the low-energy paramagnetic excitations of the rare-earth ions of the yttrium series in rare-earth garnet solid solutions is studied at liquid-helium temperatures. The interaction of nonequilibrium phonons with the low-energy excitations of Ho3+ and Tb3+, which are caused by local electric fields in a crystal lattice, is experimentally investigated. In the row of Kraemrs ions (where the nature of low-energy excitations is caused by the splitting of the ground level of a paramagnetic ion due to the local magnetic fields of neighboring ions), interaction in the nonequilibrium phonon–low-energy excitation system is only detected in the Er-containing solid solutions and is absent in the structures containing Gd3+, Dy3+, and Yb3+ rare-earth ions. In the two-level system model, the efficiency of interaction and the transport characteristics of thermal phonons are shown to depend on the type of rare-earth ion, the energy and spectral features of two-level systems, the moments of electrons in the 4f shell, and spin–lattice relaxation.
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This work was performed in terms of a state assignment and was supported in part by the Russian Foundation for Basic Research, project no. 18-07-00191.
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Taranov, A.V., Khazanov, E.N. & Charnaya, E.V. Phonon Spectroscopy of the Schottky-Like Low-Energy Paramagnetic Excitations in Garnet Solid Solution Crystals. J. Exp. Theor. Phys. 132, 94–101 (2021). https://doi.org/10.1134/S1063776121010052
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DOI: https://doi.org/10.1134/S1063776121010052