Magnetic properties of the Mg2FeV3O11?x site-disordered vanadate |
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| Institution: | 1. Solid State Section, Department of Physics, University of Athens, Panepistimiopolis, 15 784 Zografos, Athens, Greece;2. Institute of Physics, Szczecin University of Technology, Al.Piastów 17, 70-310 Szczecin, Poland;3. Physics Department, National Technical University of Athens, 157 80 Athens, Greece;4. Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa, Poland;5. Institute of Chemistry and Environmental Protection, Szczecin University of Technology, Al.Piastów 42, 71-065 Szczecin, Poland;1. Department of Solid State Physics, Faculty of Technical Physics and Applied Mathematics, Gdansk University of Technology, Gdansk, Poland;2. Institute of Molecular Physics, Polish Academy of Sciences, Poznan, Poland |
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| Abstract: | The magnetic properties of the Mg2FeV3O11?x ternary vanadate, characterized by disorder between diamagnetic Mg2+ and high-spin Fe3+ ions, are studied using dc magnetization and electron paramagnetic resonance (EPR). The dc susceptibility shows antiferromagnetic interactions between Fe3+ spins with a Curie–Weiss temperature of Θ = ?50(1) K, followed by spin-glass-like freezing at Tf ≈ 2.8 K, suggesting significant spin frustration. Temperature-dependent EPR measurements confirm the antiferromagnetic coupling of Fe3+ spins at high temperatures, while a distinct divergence is observed at T ≈ 50 K. This behavior is associated with the formation of spin clusters providing two different energy scales for the magnetic interactions. The magnetic response of Mg2FeV3O11?x is similar to that of the Zn-analogue compound, though the observed differences of the implicated energy scales indicate that magnetic inhomogeneity depends on the extent of cation disorder. |
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