1. Microscopic Spin Hamiltonian for a Dipolar Heisenberg Magnet LiGdF4 from EPR Measurements
- Author
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Sosin, S. S., Iafarova, A. F., Romanova, I. V., Morozov, O. A., Korableva, S. L., Batulin, R. G., Zhitomirsky, M., Glazkov, V. N., the Russian Academy of Sciences [Moscow, Russia] (RAS), Kazan Federal University (KFU), Laboratory of Quantum Theory (GT), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Kapitza Institute for Physical Problems [Moscow], and Russian Academy of Sciences [Moscow] (RAS)
- Subjects
[PHYS]Physics [physics] ,Condensed Matter - Strongly Correlated Electrons ,[SPI]Engineering Sciences [physics] ,Physics and Astronomy (miscellaneous) ,Strongly Correlated Electrons (cond-mat.str-el) ,FOS: Physical sciences - Abstract
Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY_{1-x}Gd_xF_4 with weak x=0.005 and moderate x=0.05 concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters are further tested by comparing a strongly anisotropic Curie-Weiss temperature obtained for LiGdF4 in our static magnetization measurements with theoretically computed values. We find a fine balance between principal magnetic interactions in LiGdF4, which results in a hidden magnetic frustration presumably leading to a delayed magnetic ordering and an enhanced magnetocaloric effect at low temperatures., Comment: 6 pages, 6 figures
- Published
- 2022
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