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Magnetic phase transitions in LaMnO 3+λ
Author(s) -
Pavlov V. I.,
Bogush A. K.,
Balyko L. V.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190215
Subject(s) - antiferromagnetism , condensed matter physics , ferromagnetism , lanthanum manganite , manganite , orthorhombic crystal system , paramagnetism , materials science , phase transition , lanthanum , curie temperature , chemistry , crystal structure , crystallography , physics , inorganic chemistry , electrode , electrolyte
Magnetic properties of nonstoichinometric lanthanum manganite LaMnO 3+λ as a function of the Mn 4+ concentration (from 0 to 27%) and temperature (from 77 to 300 K) are investigated. The Mn 4+ ions concentration depends on the degree of oxidation λ. It is shown that at 0–10% Mn 4+ there exists an antiferromagnetic ordering and at 10–14% — mixed ferro‐antiferromagnetic ordering, while at Mn 4+ concentration exceeding 14% the ferromagnetic ordering takes place. The concentrational antiferromagnetic‐ferromagnetic transition at 14% Mn 4+ is due to the crystal structural O' — O orthorhombic transition. In ferromagnetic O‐orthorhombic lanthanum manganite the phase ferromagnetic‐paramagnetic transition occurs via intermediate magnetic state where in the paramagnetic matrix there are noninteracting ferromagnetic impurity clusters. The presence of such magnetic state gives rise to anomalous behaviour of magnetic and galvanomagnetic properties of LaMnO 3+λ near Curie temperature.