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; H. Ju; R. L. Greene

doi:10.1063/1.593422

Emission Mössbauer study of CMR manganite La_0.8Ca_0.2MnO₃. II. Step-by-step snapshots of the metal-insulator transition

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We follow the step-by-step progression of events while approaching the Curie temperature T_C from below using ⁵⁷Co 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 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/T_C = 1. Zero field resistivity, ρ₀, 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.

Original language	English
Pages (from-to)	549-553
Number of pages	5
Journal	Low Temperature Physics
Volume	23
Issue number	7
DOIs	https://doi.org/10.1063/1.593422
Publication status	Published - 1997 Jul

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.593422

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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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AU - Chechersky, V.

AU - Nomura, K.

AU - Nath, A.

AU - Ju, H.

AU - Greene, R. L.

PY - 1997/7

Y1 - 1997/7

N2 - 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.

AB - 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.

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Emission Mössbauer study of CMR manganite La_0.8Ca_0.2MnO₃. II. Step-by-step snapshots of the metal-insulator transition

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