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Antiferro–ferromagnetic transformation in LaMnO 3 under neutron irradiation
Author(s) -
Chukalkin Yurii,
Teplykh Alexander,
Goshchitskii Boris
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200510032
Subject(s) - antiferromagnetism , ferromagnetism , irradiation , lanthanum , neutron diffraction , fluence , condensed matter physics , materials science , crystallite , neutron , manganese , transformation (genetics) , diffraction , chemistry , physics , nuclear physics , optics , metallurgy , biochemistry , gene
Using the methods of neutron and X‐ray diffraction analysis and magnetic measurements, polycrystalline samples of LaMnO 3 were studied before and after irradiation with fast neutrons ( E n ≥ 1 MeV) at a fluence Φ = 5.5 × 10 23 m –2 . It was established that irradiation leads to the partial (∼5%) mutual disordering of the “lanthanum” and “manganese” sublattices. Ion displacements emerging at such radiation‐induced disordering lead to the destruction of the Jahn–Teller mode Q 2 responsible for A‐type antiferromagnetism development in the initial sample. As a result, the antiferromagnet → canted ferromagnet magnetic transformation is observed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)