Chemical pressure control of Curie temperature in La0.6(Ba0.4-xCax)MnO3

R. S. Liu; C. H. Shen; S. F. Hu; J. M. Chen

doi:10.1016/S0254-0584(02)00025-1

Chemical pressure control of Curie temperature in La_0.6(Ba_0.4-xCa_x)MnO₃

R. S. Liu^*, C. H. Shen, S. F. Hu, J. M. Chen

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

9 Citations (Scopus)

Abstract

The effects on structural and paramagnetic to ferromagnetic transitions by isovalent chemical substitution of smaller Ca²⁺ into the bigger Ba²⁺ sites in La_0.6(Ba_0.4-xCa_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 in the Mn-O(1) bond length along the c-axis which corresponds to the Jahn-Teller distortion of the distorted MnO₆ octahedra in the orthorhombic cell. This effect gives rise to a decrease in T_C (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

Original language	English
Pages (from-to)	26-31
Number of pages	6
Journal	Materials Chemistry and Physics
Volume	75
Issue number	1-3
DOIs	https://doi.org/10.1016/S0254-0584(02)00025-1
Publication status	Published - 2002 Apr 28
Externally published	Yes
Event	ICMAT 2001 Symposium C (Novel and Advanced Ceramics) - Singapore, Singapore Duration: 2002 Apr 28 → …

Keywords

Chemical substitution
Colossal magnetoresistance
Curie temperature
Magnetic
Manganites

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1016/S0254-0584(02)00025-1

Cite this

@article{20aad43107a9466c8e79a4dca1314773,

title = "Chemical pressure control of Curie temperature in La0.6(Ba0.4-xCax)MnO3",

abstract = "The effects on structural and paramagnetic to ferromagnetic transitions by isovalent chemical substitution of smaller Ca2+ into the bigger Ba2+ sites in La0.6(Ba0.4-xCax)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 in the Mn-O(1) bond length along the c-axis which corresponds to the Jahn-Teller distortion of the distorted MnO6 octahedra in the orthorhombic cell. This effect gives rise to a decrease in TC (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.",

keywords = "Chemical substitution, Colossal magnetoresistance, Curie temperature, Magnetic, Manganites",

author = "Liu, {R. S.} and Shen, {C. H.} and Hu, {S. F.} and Chen, {J. M.}",

note = "Funding Information: This research is financially supported by the National Science Council of the Republic of China under grant number NSC 90-2113-M-002-048.; ICMAT 2001 Symposium C (Novel and Advanced Ceramics) ; Conference date: 28-04-2002",

year = "2002",

month = apr,

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doi = "10.1016/S0254-0584(02)00025-1",

language = "English",

volume = "75",

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journal = "Materials Chemistry and Physics",

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TY - JOUR

T1 - Chemical pressure control of Curie temperature in La0.6(Ba0.4-xCax)MnO3

AU - Liu, R. S.

AU - Shen, C. H.

AU - Hu, S. F.

AU - Chen, J. M.

N1 - Funding Information: This research is financially supported by the National Science Council of the Republic of China under grant number NSC 90-2113-M-002-048.

PY - 2002/4/28

Y1 - 2002/4/28

N2 - The effects on structural and paramagnetic to ferromagnetic transitions by isovalent chemical substitution of smaller Ca2+ into the bigger Ba2+ sites in La0.6(Ba0.4-xCax)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 in the Mn-O(1) bond length along the c-axis which corresponds to the Jahn-Teller distortion of the distorted MnO6 octahedra in the orthorhombic cell. This effect gives rise to a decrease in TC (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

AB - The effects on structural and paramagnetic to ferromagnetic transitions by isovalent chemical substitution of smaller Ca2+ into the bigger Ba2+ sites in La0.6(Ba0.4-xCax)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 in the Mn-O(1) bond length along the c-axis which corresponds to the Jahn-Teller distortion of the distorted MnO6 octahedra in the orthorhombic cell. This effect gives rise to a decrease in TC (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.

KW - Chemical substitution

KW - Colossal magnetoresistance

KW - Curie temperature

KW - Magnetic

KW - Manganites

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DO - 10.1016/S0254-0584(02)00025-1

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SN - 0254-0584

VL - 75

SP - 26

EP - 31

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 1-3

T2 - ICMAT 2001 Symposium C (Novel and Advanced Ceramics)

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ER -