Microscopic Spin Hamiltonian for a Dipolar Heisenberg Magnet LiGdF4 from EPR Measurements - Archive ouverte HAL
Article Dans Une Revue JETP Letters Année : 2022

Microscopic Spin Hamiltonian for a Dipolar Heisenberg Magnet LiGdF4 from EPR Measurements

Résumé

Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY 1 ‒ x Gd x F 4 with low $$x = 0.005$$ 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 LiGdF 4 material, including the nearest-neighbor exchange constant. The obtained parameters are further tested by comparing a strongly anisotropic Curie–Weiss temperature obtained for LiGdF 4 in our static magnetization measurements with theoretically computed values. We find a fine balance between principal magnetic interactions in LiGdF 4 , which results in a hidden magnetic frustration presumably leading to a delayed magnetic ordering and an enhanced magnetocaloric effect at low temperatures.

Dates et versions

hal-03956941 , version 1 (25-01-2023)

Identifiants

Citer

S. Sosin, A. Iafarova, I. Romanova, O. Morozov, S. Korableva, et al.. Microscopic Spin Hamiltonian for a Dipolar Heisenberg Magnet LiGdF4 from EPR Measurements. JETP Letters, 2022, 116 (11), pp.771-778. ⟨10.1134/S0021364022602299⟩. ⟨hal-03956941⟩
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