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

^*此作品的通信作者

研究成果: 雜誌貢獻 › 會議論文 › 同行評審

9 引文斯高帕斯（Scopus）

摘要

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.

原文	英語
頁（從 - 到）	26-31
頁數	6
期刊	Materials Chemistry and Physics
卷	75
發行號	1-3
DOIs	https://doi.org/10.1016/S0254-0584(02)00025-1
出版狀態	已發佈 - 2002 4月 28
對外發佈	是
事件	ICMAT 2001 Symposium C (Novel and Advanced Ceramics) - Singapore, 新加坡持續時間: 2002 4月 28 → …

ASJC Scopus subject areas

一般材料科學
凝聚態物理學

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10.1016/S0254-0584(02)00025-1

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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",

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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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U2 - 10.1016/S0254-0584(02)00025-1

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

M3 - Conference article

AN - SCOPUS:0037188134

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)

Y2 - 28 April 2002

ER -

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

摘要

ASJC Scopus subject areas

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