EPR of Gd3+-Doped La0.9Nd0.1F3 Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations
M.L. Paradowski and L.E. Misiak
Institute of Physics, Maria Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland
Received: June 5, 1998; revised version January 25, 1999
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The X-band EPR study of Gd3+-doped La0.9Nd0.1F3 single crystal in the temperature range 4.2-295 K is carried out in order to investigate crystal field effects, the Gd3+ spin-phonon interactions, as well as Gd3+ and Nd3+ spin-lattice relaxation times. The local distortions at 4.2 K of the positions of the eight F- ions surrounding the Gd3+ ion in the La0.9Nd0.1F3 crystal were determined from comparison of the theoretical with the experimental spin-Hamiltonian parameters. The spin-phonon interactions can be described by the Einstein model, which better characterizes the behavior of paramagnetic centers in LaF3 and La0.9Nd0.1F3 crystals than the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain.
DOI: 10.12693/APhysPolA.95.367
PACS numbers: 76.30.Kg