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Electron Paramagnetic Resonance and the Modified Landau–Lifshitz Equation in Strongly Correlated Electronic Systems with Quantum Fluctuations of the Magnetic Moment

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Abstract

The Landau–Lifshitz equation modified by quantum fluctuations of the magnetic moment is proposed, on the basis of which several new effects in electron paramagnetic resonance in strongly correlated electronic systems are predicted, including an increase in the integral intensity and the appearance of universal relations connecting the contribution to the linewidth, the shift of the resonance field, and the integrated intensity. It is expected that the magnitude of the quantum corrections will depend on a single dimensionless parameter \(\sim 2\Delta M_{z}^{2}{\text{/}}{{\mu }_{{\text{B}}}}{{M}_{0}}\), where ΔMz and M0 are the amplitude of fluctuations and the average value of the magnetic moment per magnetic ion, respectively.

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ACKNOWLEDGMENTS

The author is grateful to V.N. Ryzhov for useful discussions.

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Authors and Affiliations

  1. Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia

    S. V. Demishev

  2. National Research University Higher School of Economics, Moscow, Russia

    S. V. Demishev

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  1. S. V. Demishev
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Correspondence to S. V. Demishev.

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Demishev, S.V. Electron Paramagnetic Resonance and the Modified Landau–Lifshitz Equation in Strongly Correlated Electronic Systems with Quantum Fluctuations of the Magnetic Moment. Dokl. Phys. 66, 187–190 (2021). https://doi.org/10.1134/S1028335821070028

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  • DOI: https://doi.org/10.1134/S1028335821070028

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