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Emission Mössbauer study of CMR manganite La 0.8 Ca 0.2 MnO 3 . II. Step-by-step snapshots of the metal-insulator transition
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Emission Mössbauer study of CMR manganite La 0.8 Ca 0.2 MnO 3 . II. Step-by-step snapshots of the metal-insulator transition

V. Chechersky, K. Nomura, A. Nath, H. Ju and R. L. Greene
Low temperature physics (Woodbury, N.Y.), v 23(7), pp 549-553
Jul 1997
DOI: https://doi.org/10.1063/1.593422
url
http://dspace.nbuv.gov.ua/handle/123456789/175714View
SubmittedOpen Access (License Unspecified),  Open

Abstract

We follow the step-by-step progression of events while approaching the Curie temperature T C from below using 57 Co substituent as a microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33<T/T C ⩽1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T⩾T C , the electrons are localized to neighboring Mn 4+ /Mn 3+ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65⩽T/T C =1. Zero field resistivity, ρ 0 , follows linearly with the amount of the paramagnetic phase in the range 0.65⩽T/T C ⩽1 and still shows metal-like behavior up to T/T C =1.03.

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Physics, Applied
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