Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3. II. Step-by-step snapshots of the metal-insulator transition

V. Chechersky, K. Nomura, A. Nath, Honglyoul Ju, R. L. Greene

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Abstract

We follow the step-by-step progression of events while approaching the Curie temperature TC from below using 57Co substituent as a microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC ≤ 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 ≥ TC, the electrons are localized to neighboring Mn4+/Mn3+ 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/TC = 1. Zero field resistivity, ρ0, follows linearly with the amount of the paramagnetic phase in the range 0.65 ≤ T/TC ≤ 1 and still shows metal-like behavior up to T/TC = 1.03.

Original languageEnglish
Pages (from-to)549-553
Number of pages5
JournalLow Temperature Physics
Volume23
Issue number7
DOIs
Publication statusPublished - 1997 Jan 1

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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