The effect of Fe substitution on the structural transition of LaMn 1-xFexO3 manganites: A raman spectroscopy study

Nguyen Van Minh; Nguyen Quang Hoc; L. T. Ha Phuong; In Sang Yang

doi:10.1142/s0218863506003323

The effect of Fe substitution on the structural transition of LaMn _1-xFe_xO₃ manganites: A raman spectroscopy study

Nguyen Van Minh, Nguyen Quang Hoc, L. T. Ha Phuong, In Sang Yang

Department of Physics

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

1 Scopus citations

Abstract

We present results of Raman scattering studies on LaMn_1-xFe _xO_3+δ manganite over a wide range of doping content (x = 0.1 -0.75). There is no previous Raman work on the LaMn_1-x. Fe_xO_3+δ manganite system. The analysis of Raman spectra of various doping contents allows us to identify a clear spectroscopic signature of structural change from orthorhombic to rhombohedral at x = 0.4 as x increases. At x = 0.4, both phases coexist. This result is in good agreement with our XRD results. The resistance vs. temperature relation indicates that there is no metal-insulator transition in these samples in the range of observed temperatures. No abrupt change in the peak frequencies is observed across the measured temperatures. This indicates that the structural changes are not spatially coherent, but local in nature.

Original language	English
Pages (from-to)	315-321
Number of pages	7
Journal	Journal of Nonlinear Optical Physics and Materials
Volume	15
Issue number	3
DOIs	https://doi.org/10.1142/s0218863506003323
State	Published - Sep 2006

Keywords

Fe substitution
Manganites
Metal-insulator transition
Raman spectroscopy

Access to Document

10.1142/s0218863506003323

Cite this

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title = "The effect of Fe substitution on the structural transition of LaMn 1-xFexO3 manganites: A raman spectroscopy study",

abstract = "We present results of Raman scattering studies on LaMn1-xFe xO3+δ manganite over a wide range of doping content (x = 0.1 -0.75). There is no previous Raman work on the LaMn1-x. FexO3+δ manganite system. The analysis of Raman spectra of various doping contents allows us to identify a clear spectroscopic signature of structural change from orthorhombic to rhombohedral at x = 0.4 as x increases. At x = 0.4, both phases coexist. This result is in good agreement with our XRD results. The resistance vs. temperature relation indicates that there is no metal-insulator transition in these samples in the range of observed temperatures. No abrupt change in the peak frequencies is observed across the measured temperatures. This indicates that the structural changes are not spatially coherent, but local in nature.",

keywords = "Fe substitution, Manganites, Metal-insulator transition, Raman spectroscopy",

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T1 - The effect of Fe substitution on the structural transition of LaMn 1-xFexO3 manganites

T2 - A raman spectroscopy study

AU - Minh, Nguyen Van

AU - Hoc, Nguyen Quang

AU - Ha Phuong, L. T.

AU - Yang, In Sang

PY - 2006/9

Y1 - 2006/9

N2 - We present results of Raman scattering studies on LaMn1-xFe xO3+δ manganite over a wide range of doping content (x = 0.1 -0.75). There is no previous Raman work on the LaMn1-x. FexO3+δ manganite system. The analysis of Raman spectra of various doping contents allows us to identify a clear spectroscopic signature of structural change from orthorhombic to rhombohedral at x = 0.4 as x increases. At x = 0.4, both phases coexist. This result is in good agreement with our XRD results. The resistance vs. temperature relation indicates that there is no metal-insulator transition in these samples in the range of observed temperatures. No abrupt change in the peak frequencies is observed across the measured temperatures. This indicates that the structural changes are not spatially coherent, but local in nature.

AB - We present results of Raman scattering studies on LaMn1-xFe xO3+δ manganite over a wide range of doping content (x = 0.1 -0.75). There is no previous Raman work on the LaMn1-x. FexO3+δ manganite system. The analysis of Raman spectra of various doping contents allows us to identify a clear spectroscopic signature of structural change from orthorhombic to rhombohedral at x = 0.4 as x increases. At x = 0.4, both phases coexist. This result is in good agreement with our XRD results. The resistance vs. temperature relation indicates that there is no metal-insulator transition in these samples in the range of observed temperatures. No abrupt change in the peak frequencies is observed across the measured temperatures. This indicates that the structural changes are not spatially coherent, but local in nature.

KW - Fe substitution

KW - Manganites

KW - Metal-insulator transition

KW - Raman spectroscopy

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