mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-100Research ArticleСтатьиAngular and temperature dependencies of EPR linewidth and Gorter relaxation rates in concentrated paramagnets: Application to La0.9Sr0.1MnO3 and La0.875Sr0.125MnO3KhalvashiE. Kh.

Ninoshvili str. 35, Batumi 6010

enver.khalvashi@bsu.edu.geFokinaN. P.

Kostava str. 77, Tbilisi 0175

ElizbarashviliM. O.

Sandro Euli str. 5, Tbilisi 0186

Batumi Shota Rustaveli State UniversityGeorgiaDepartment of Science, Georgian Technical UniversityGeorgiaVladimir Chavchanidze Institute of Cybernetics, Georgian Technical UniversityGeorgia20170302201719117101 (17 pp.)Copyright © Khalvashi E.K., Fokina N.P., Elizbarashvili M.O., 20242024Khalvashi E.K., Fokina N.P., Elizbarashvili M.O.Khalvashi E.K., Fokina N.P., Elizbarashvili M.O.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/100

The angular and temperature dependencies of the electron paramagnetic resonance (EPR) linewidth in the weak constant field and of the relaxation rates measurable by the Gorter type experiments in zero constant magnetic field (Gorter RRs) are analytically investigated in magnetically concentrated paramagnets with the dominating exchange interaction. The consideration is restricted to the experiments, where the EPR linewidth is both anisotropic and linear over the temperature. It is suggested that under such conditions the EPR broadening is caused by the spin-lattice relaxation of the anisotropic interaction via the one-phonon mechanism. The analytical results are brought to the form suitable for the extraction of the Dzyaloshinsky-Moriya and the crystal field interaction constants from the experiment. It is shown that the EPR linewidth at the constant field direction along any crystal axis is equal to the half sum of the zero-field RRs for the two other crystal axes. The obtained results are successfully used for the interpretation of the EPR experimental results in the La0.9Sr0.1MnO3 and La0.875Sr0.125MnO3 single crystals in the Jahn-Teller strongly distorted phase in the definite temperature interval. The angular dependencies of the Gorter RRs and the EPR linewidth are presented graphically at the constant field continuous rotations in the three crystallographic planes in La0.9Sr0.1MnO3.

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