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

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

Research output: Contribution to journalConference article

6 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 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.

Original languageEnglish
Pages (from-to)26-31
Number of pages6
JournalMaterials Chemistry and Physics
Volume75
Issue number1-3
DOIs
Publication statusPublished - 2002 Apr 28
EventICMAT 2001 Symposium C (Novel and Advanced Ceramics) - Singapore, Singapore
Duration: 2002 Apr 28 → …

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Jahn-Teller effect
Pressure control
Bond length
Curie temperature
Substitution reactions
cells
Temperature
substitutes
temperature

Keywords

  • Chemical substitution
  • Colossal magnetoresistance
  • Curie temperature
  • Magnetic
  • Manganites

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Chemical pressure control of Curie temperature in La0.6(Ba0.4-xCax)MnO3. / Liu, R. S.; Shen, C. H.; Hu, Shu-Fen; Chen, J. M.

In: Materials Chemistry and Physics, Vol. 75, No. 1-3, 28.04.2002, p. 26-31.

Research output: Contribution to journalConference article

Liu, R. S. ; Shen, C. H. ; Hu, Shu-Fen ; Chen, J. M. / Chemical pressure control of Curie temperature in La0.6(Ba0.4-xCax)MnO3. In: Materials Chemistry and Physics. 2002 ; Vol. 75, No. 1-3. pp. 26-31.
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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.",
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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.

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KW - Colossal magnetoresistance

KW - Curie temperature

KW - Magnetic

KW - Manganites

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