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Title: Transport properties and magnetic behavior in the polycrystalline lanthanum-deficient manganate perovskites ({approx}La{sub 1{minus}x}MnO{sub 3})

Abstract

The rhombohedral lanthanum manganates {approx}La{sub 1{minus}x}MnO{sub 3} (x = 0.0, 0.05, 0.1) were prepared by a soft chemistry route to test first as catalysts. These three weak ferromagnets exhibit a structural transition at T{sub t} slightly below T{sub c}. {approx}La{sub 0.9}MnO{sub 3} undergoes a group-subgroup R{bar 3}c {leftrightarrow} R3c transition most likely of second order. {approx}LaMnO{sub 3} does not show any insulator-to-metal transition, but does show a semiconductor-semiconductor at T{sub t} {approximately} 130 K. Analysis of the transport data (conductivity and thermopower) indicates hopping of polarons at both low and high temperature. An effective magnetic moment of 3.50 {micro}{sub B}/Mn is deduced from the spontaneous magnetization value at 5 K. The slight difference from the spin-only value (3.67 {micro}{sub B}) is assigned to a spin-canting effect which is reflected in the divergence of the FC and ZFC susceptibility curves at low fields (H {le} 10{sup {minus}2} T) and low temperature. Compared with recent results on thin films, the compositions x = 0.05, 0.1 are expected to show magnetoresistive effects as well as a semiconductor-to-metal transition. If it is verified on bulk samples which all contain a similar Mn{sup 4+} content of 35%, the structural transition at T{sub t} could bemore » considered as magnetically driven.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. Univ. de Nantes (France)
  2. Univ. de Bordeaux I, Pessac (France). Inst. de Chimie de la Matiere Condensee de Bordeaux
Publication Date:
OSTI Identifier:
514717
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 32; Journal Issue: 6; Other Information: PBD: Jun 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; MANGANESE OXIDES; CRYSTAL-PHASE TRANSFORMATIONS; MAGNETIC PROPERTIES; TRANSITION TEMPERATURE; MAGNETIC SUSCEPTIBILITY; CATALYSTS; MAGNETORESISTANCE

Citation Formats

Ferris, V, Goglio, G, Brohan, L, Joubert, O, Molinie, P, Ganne, M, and Dordor, P. Transport properties and magnetic behavior in the polycrystalline lanthanum-deficient manganate perovskites ({approx}La{sub 1{minus}x}MnO{sub 3}). United States: N. p., 1997. Web. doi:10.1016/S0025-5408(97)00044-5.
Ferris, V, Goglio, G, Brohan, L, Joubert, O, Molinie, P, Ganne, M, & Dordor, P. Transport properties and magnetic behavior in the polycrystalline lanthanum-deficient manganate perovskites ({approx}La{sub 1{minus}x}MnO{sub 3}). United States. https://doi.org/10.1016/S0025-5408(97)00044-5
Ferris, V, Goglio, G, Brohan, L, Joubert, O, Molinie, P, Ganne, M, and Dordor, P. Sun . "Transport properties and magnetic behavior in the polycrystalline lanthanum-deficient manganate perovskites ({approx}La{sub 1{minus}x}MnO{sub 3})". United States. https://doi.org/10.1016/S0025-5408(97)00044-5.
@article{osti_514717,
title = {Transport properties and magnetic behavior in the polycrystalline lanthanum-deficient manganate perovskites ({approx}La{sub 1{minus}x}MnO{sub 3})},
author = {Ferris, V and Goglio, G and Brohan, L and Joubert, O and Molinie, P and Ganne, M and Dordor, P},
abstractNote = {The rhombohedral lanthanum manganates {approx}La{sub 1{minus}x}MnO{sub 3} (x = 0.0, 0.05, 0.1) were prepared by a soft chemistry route to test first as catalysts. These three weak ferromagnets exhibit a structural transition at T{sub t} slightly below T{sub c}. {approx}La{sub 0.9}MnO{sub 3} undergoes a group-subgroup R{bar 3}c {leftrightarrow} R3c transition most likely of second order. {approx}LaMnO{sub 3} does not show any insulator-to-metal transition, but does show a semiconductor-semiconductor at T{sub t} {approximately} 130 K. Analysis of the transport data (conductivity and thermopower) indicates hopping of polarons at both low and high temperature. An effective magnetic moment of 3.50 {micro}{sub B}/Mn is deduced from the spontaneous magnetization value at 5 K. The slight difference from the spin-only value (3.67 {micro}{sub B}) is assigned to a spin-canting effect which is reflected in the divergence of the FC and ZFC susceptibility curves at low fields (H {le} 10{sup {minus}2} T) and low temperature. Compared with recent results on thin films, the compositions x = 0.05, 0.1 are expected to show magnetoresistive effects as well as a semiconductor-to-metal transition. If it is verified on bulk samples which all contain a similar Mn{sup 4+} content of 35%, the structural transition at T{sub t} could be considered as magnetically driven.},
doi = {10.1016/S0025-5408(97)00044-5},
url = {https://www.osti.gov/biblio/514717}, journal = {Materials Research Bulletin},
number = 6,
volume = 32,
place = {United States},
year = {1997},
month = {6}
}