Chemical pressure controlled colossal magnetoresistance effects in Lao0.6(Sr0.4-xCax)MnO3

R. S. Liu; C. H. Shen; Shu-Fen Hu

doi:10.1016/S1466-6049(01)00056-3

Chemical pressure controlled colossal magnetoresistance effects in Lao_0.6(Sr_0.4-xCa_x)MnO₃

R. S. Liu, C. H. Shen, Shu-Fen Hu

Department of Physics

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

4 Citations (Scopus)

Abstract

The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca²⁺ into the bigger Sr²⁺ sites in Lao_0.6(Sr_0.4-x) MnO₃(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO₆ octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

Original language	English
Pages (from-to)	1063-1072
Number of pages	10
Journal	International Journal of Inorganic Materials
Volume	3
Issue number	7
DOIs	https://doi.org/10.1016/S1466-6049(01)00056-3
Publication status	Published - 2001 Dec 1

Keywords

A. oxides
B. chemical synthesis
D. crystal structure
D. magnetic properties

ASJC Scopus subject areas

Materials Chemistry

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10.1016/S1466-6049(01)00056-3

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title = "Chemical pressure controlled colossal magnetoresistance effects in Lao0.6(Sr0.4-xCax)MnO3",

abstract = "The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca2+ into the bigger Sr2+ sites in Lao0.6(Sr0.4-x) MnO3(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO6 octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.",

keywords = "A. oxides, B. chemical synthesis, D. crystal structure, D. magnetic properties",

author = "Liu, {R. S.} and Shen, {C. H.} and Shu-Fen Hu",

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T1 - Chemical pressure controlled colossal magnetoresistance effects in Lao0.6(Sr0.4-xCax)MnO3

AU - Liu, R. S.

AU - Shen, C. H.

AU - Hu, Shu-Fen

PY - 2001/12/1

Y1 - 2001/12/1

N2 - The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca2+ into the bigger Sr2+ sites in Lao0.6(Sr0.4-x) MnO3(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO6 octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

AB - The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca2+ into the bigger Sr2+ sites in Lao0.6(Sr0.4-x) MnO3(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO6 octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

KW - A. oxides

KW - B. chemical synthesis

KW - D. crystal structure

KW - D. magnetic properties

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