mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal University10.26907/mrsej-19103mrisel-39Research ArticleСтатьиAnomalous 141Pr nuclear magnetic relaxation in PrF3 Van Vleck paramagnetAleksandrovA. S.

420008 Kazan

EgorovA. V.

420008 Kazan; 420111 Kazan

alexander.egorov@kpfu.ruKorablevaS. L.

420008 Kazan

TagirovM. S.

420008 Kazan; 420111 Kazan

Institute of Physics, Kazan Federal UniversityRussian FederationInstitute of Physics, Kazan Federal University; Institute of Applied Research, Tatarstan Academy of SciencesRussian Federation20193001201921119103 (5 pp.)Copyright © Aleksandrov A.S., Egorov A.V., Korableva S.L., Tagirov M.S., 20242024Aleksandrov A.S., Egorov A.V., Korableva S.L., Tagirov M.S.Aleksandrov A.S., Egorov A.V., Korableva S.L., Tagirov M.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/39

The magnetic nuclear spin-lattice relaxation has been studied in PrF3. It was found that 141Pr spin lattice relaxation rate is untypically high for the Van Vleck insulator. According to all existing experimental data the only relaxation channel for enhanced nuclear moments at low temperatures is interaction with paramagnetic impurities and typical nuclear relaxation rate in rare earth Van Vleck paramagnets at liquid helium temperatures is 1 s−1. The measured value is 100 s−1. At the assumption that relaxation is caused by the strong 4f-4f cooperative interaction mediated by phonons [1], we measured 141Pr relaxation rates in a number of PrxLa1−xF3 samples and found that in diluted samples relaxation slows down to the usual for insulators values.

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The authors declare that there are no conflicts of interest present.