Abstract
For La 3+0.825 Sr 20.175 +Mn3+O 2−2.912 anion-deficient manganite, the specific magnetization, the dynamic magnetic susceptibility, and the heat capacity are investigated. This material is found to be an inhomogeneous ferromagnet below the Curie point T C ≈ 122 K, which is much lower than the Curie point determined for the stoichiometric composition (T C ≈ 268 K). An increase in magnetic field by two orders of magnitude leads to an increase in the Curie temperature by ΔT ≈ 12 K. The presence of oxygen vacancies leads to the frustration of a part, namely, V fr ≈ 22%, of the indirect Mn3+-O-Mn3+ exchange interactions, but the spin glass state is not realized. The ferromagnetic matrix of the material under study is characterized by a scatter in the exchange interaction intensities. The heat capacity is found to exhibit an anomalous behavior. Based on the Banerjee magnetic criterion, it is established that the ferromagnet-paramagnet transition observed for La 3+0.825 Sr 2+0.175 Mn3+O 2−2.912 anion-deficient manganite is a second-order thermodynamic phase transition. The mechanism and origin of the critical behavior of the system under investigation are discussed.
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Original Russian Text © S.V. Trukhanov, A.V. Trukhanov, A.N. Vasil’ev, A. Maignan, H. Szymczak, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 10, pp. 615–620.
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Trukhanov, S.V., Trukhanov, A.V., Vasil’ev, A.N. et al. Critical behavior of La0.825Sr0.175MnO2.912 anion-deficient manganite in the magnetic phase transition region. Jetp Lett. 85, 507–512 (2007). https://doi.org/10.1134/S0021364007100086
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DOI: https://doi.org/10.1134/S0021364007100086