Crystal structures, strain analysis, and physical properties of Sr 0.7Ce 0.3MnO 3

Zhaoming Zhang, Brendan J. Kennedy, Christopher J. Howard, Michael A. Carpenter, Wojciech Miiller, Kevin S. Knight, Motohide Matsuda, Michihiro Miyake

Research output: Contribution to journalArticle

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Abstract

We have studied the crystal structure of mixed-valence Sr 0.7Ce 0.3MnO 3 from 4.2 to 973 K using high-resolution neutron powder diffraction. The crystal structure is tetragonal in space group I4/mcm at 4.2-923 K and cubic in Pm3̄m at T 948 K. Lattice parameters and Mn-O bond distances, obtained by Rietveld refinement, have been used to derive the spontaneous strains and MnO 6 octahedral distortion, which are interpreted in terms of strain/order parameter coupling using a single Landau free-energy expansion for a Pm3̄m reference structure with two instabilities (R4+ and Γ3+). Two phase transitions were proposed: an octahedral tilting transition at T c,φ ∼ 938 K (Pm3̄m I4/mcm, R4+), and an isosymmetric, electronically driven (Jahn-Teller-like) transition at T c,JT ∼ 770 K (I4/mcm, R4+ I4/mcm, R4+ and Γ3+). The nature of the tilting transition appears to be tricritical, while that of the Jahn-Teller-like transition is second order. In addition to the contributions from octahedral tilting and Jahn-Teller-like distortions, there is an excess octahedral distortion at temperatures below 250 K; this is speculated to be associated with an anomaly observed over the temperature range of 275-300 K in the heat-capacity measurements.

Original languageEnglish
Article number174110
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number17
DOIs
Publication statusPublished - May 24 2012

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Physical properties
physical properties
Crystal structure
crystal structure
Rietveld refinement
Neutron powder diffraction
Free energy
Lattice constants
Specific heat
Phase transitions
Temperature
lattice parameters
free energy
specific heat
anomalies
valence
neutrons
expansion
temperature
high resolution

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Zhang, Z., Kennedy, B. J., Howard, C. J., Carpenter, M. A., Miiller, W., Knight, K. S., ... Miyake, M. (2012). Crystal structures, strain analysis, and physical properties of Sr 0.7Ce 0.3MnO 3 Physical Review B - Condensed Matter and Materials Physics, 85(17), [174110]. https://doi.org/10.1103/PhysRevB.85.174110

Crystal structures, strain analysis, and physical properties of Sr 0.7Ce 0.3MnO 3 . / Zhang, Zhaoming; Kennedy, Brendan J.; Howard, Christopher J.; Carpenter, Michael A.; Miiller, Wojciech; Knight, Kevin S.; Matsuda, Motohide; Miyake, Michihiro.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 17, 174110, 24.05.2012.

Research output: Contribution to journalArticle

Zhang, Z, Kennedy, BJ, Howard, CJ, Carpenter, MA, Miiller, W, Knight, KS, Matsuda, M & Miyake, M 2012, 'Crystal structures, strain analysis, and physical properties of Sr 0.7Ce 0.3MnO 3 ', Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 17, 174110. https://doi.org/10.1103/PhysRevB.85.174110
Zhang, Zhaoming ; Kennedy, Brendan J. ; Howard, Christopher J. ; Carpenter, Michael A. ; Miiller, Wojciech ; Knight, Kevin S. ; Matsuda, Motohide ; Miyake, Michihiro. / Crystal structures, strain analysis, and physical properties of Sr 0.7Ce 0.3MnO 3 In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 17.
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