Phase transition study in α-Fe2WO6 compound by EPR |
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Authors: | N Guskos J Typek M Wabia V Likodimos H Fuks I Rychlowska-Himmel J Walczak |
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Institution: | 1. Solid State Section, Department of Physics, University of Athens, Athens, Greece 2. Institute of Physics, Technical University of Szczecin, Szczecin, Poland 3. Department of Inorganic Chemistry, Technical University of Szczecin, Szczecin, Poland
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Abstract: | The temperature dependence of the EPR spectrum for the α-phase of iron tungstate has been investigated in the temperature range of 40–260 K. At temperatures betweenT 1 ≈ 250 K andT 2 ≈ 205 K where the antiferromagnetic phase transition occurs, a relatively narrow EPR line arising from the dominant iron(III) species has emerged, gaining intensity with the temperature increase. Its linewidth temperature evolution could be described by Huber equation, with TN = 200 K, which is consistent with the peak seen in magnetic susceptibility measurements, while the correspondingg-factor shifts to higher fields reflecting the build-up of internal field emerging from increasing shortrange order in the spin system. At temperatures lower than T2, a very broad and distorted EPR line with temperature dependentg-factor and linewidth has been observed reflecting the corresponding rise of the magnetic susceptibility below the antiferromagnetic phase transition, presumably arising from magnetic clusters embedded in the antiferromagnetic background. |
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