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Emission Mössbauer study of CMR manganite La 0.8 Ca 0.2 MnO 3 . I. Anomalous ferromagnetism
Journal article   Open access   Peer reviewed

Emission Mössbauer study of CMR manganite La 0.8 Ca 0.2 MnO 3 . I. Anomalous ferromagnetism

V. Chechersky, A. Nath, H. Ju and R. L. Greene
Low temperature physics (Woodbury, N.Y.), v 23(7), pp 545-548
Jul 1997
DOI: https://doi.org/10.1063/1.593421
url
http://dspace.nbuv.gov.ua/handle/123456789/175713View
SubmittedOpen Access (License Unspecified),  Open

Abstract

Using 57 Co emission Mössbauer technique, we present clear evidence that in Ca-doped manganite, the magnetic and paramagnetic phases coexist below T C , with the abundance of the latter increasing with temperature. In contrast with the regular ferromagnetic materials, the variation of the hyperfine internal magnetic field H int with temperature deviates considerably from the Brillouin relation, and exhibits an abrupt drop at T C . These features characterize the magnetic transition as a first-order transition. The non-Brillouin behavior of H int (T) and the temperature dependence of the shape of the magnetically split sextet indicate the presence of spin fluctuations in this material well below T C .

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Domestic collaboration
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Physics, Applied
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