Abstract.
The crystal structure, magnetization and electrical transport depending on the temperature and magnetic field for the doped stoichiometric \({\rm La}_{1-x}^{3 + } {\rm Sr}_x^{2 + } {\rm Mn}_{1-x}^{3 + } {\rm Mn}_x^{4 + } {\rm O}_3^{2-} \) as well as anion-deficient \({\rm La}_{1-x}^{3 + } {\rm Sr}_x^{2 + } {\rm Mn}^{3 + }{\rm O}_{3-x/2}^{2-} \) (\(0\le x \le 0.30\)) ortomanganite systems have been experimentally studied. It is established that the stochiometric samples in the region of the \(0 \le x \le 0.125\) are an \({\rm O}'\)-orthorhombic perovskites whereas in the \(0.175 \le x \le 0.30\) - a rhombohedric. For the anion-deficient system the symmetry type of the unit cell is similar to the stoichiometric one. As a doping level increases the samples in the ground state undergo a number of the magnetic transitions. It is assumed that the samples with the large amount of oxygen vacancies are a cluster spin glasses (\(0.175 < x \le 0.30\)) and temperature of the magnetic moment freezing is ~40 K. All the anion-deficient samples are semiconductors and show considerable magnetoresistance over a wide temperature range with a peak for the x = 0.175 only. Concentration dependences of the spontaneous magnetization and magnetic ordering temperature for the anion-deficient \({\rm La}_{1-x}^{3 + } {\rm Sr}_x^{2 + } {\rm Mn}^{3 + }{\rm O}_{3-x/2}^{2-} \) system have been established by the magnetic measurements and compared with those for the stoichiometric \({\rm La}_{1-x}^{3 + } {\rm Sr}_x^{2 + } {\rm Mn}_{1-x}^{3 + } {\rm Mn}_x^{4 + } {\rm O}_3^{2-} \) one. The magnetic propeprties of the anion-deficient samples may be interpreted on the base of the superexchange interaction and phase separation (chemical disorder) models.
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Received: 14 July 2004, Published online: 26 November 2004
PACS:
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) - 75.30.Vn Colossal magnetoresistance - 75.50.Dd Nonmetallic ferromagnetic materials
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Trukhanov, S.V., Lobanovski, L.S., Bushinsky, M.V. et al. Influence of oxygen vacancies on the magnetic and electrical properties of La \(\mathsf{_{1-x}}\)Sr\(\mathsf{_{x}}\)MnO \(\mathsf{_{3-x/2}}\) manganites. Eur. Phys. J. B 42, 51–61 (2004). https://doi.org/10.1140/epjb/e2004-00357-8
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DOI: https://doi.org/10.1140/epjb/e2004-00357-8