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

Research output: Contribution to journalArticle

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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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insulators
electrical resistivity
progressions
metals
Curie temperature
electrons
matrices
atoms
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Emission M{\"o}ssbauer study of CMR manganite La0.8Ca0.2MnO3. II. Step-by-step snapshots of the metal-insulator transition",
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 M{\"o}ssbauer 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.",
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Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3. II. Step-by-step snapshots of the metal-insulator transition. / Chechersky, V.; Nomura, K.; Nath, A.; Ju, Honglyoul; Greene, R. L.

In: Low Temperature Physics, Vol. 23, No. 7, 01.01.1997, p. 549-553.

Research output: Contribution to journalArticle

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