Evolution of (La1-yPry)0.7Ca0.3MnO3 crystal structure with A-cation size, temperature, and oxygen isotope substitution

A. M. Balagurov, V. Yu Pomjakushin, D. V. Sheptyakov, V. Aksenov, N. A. Babushkina, L. M. Belova, O. Yu Gorbenko, A. R. Kaul

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The atomic structure of (La1-yPry)0.7Ca0.3MnO3 compound with 0.5 ≤ y ≤ 1 has been systematically studied by neutron powder diffraction in the temperature range from 15 to 293 K. For composition with y = 0.75, the structural analysis was performed on two samples, one containing the natural mixture of oxygen isotopes and the other one 75% enriched by 18O. The room temperature structural characteristics of the series, including cell volume, average Mn-O bond distance, and average Mn-O-Mn bond angle, are the linear functions of the 〈rA〉. Temperature dependencies of these parameters are quite smooth, except for the point T = TFM, where a jump like changes occur. The isotope enriched samples have been found identical in crystal and magnetic structure down to the temperature of transition of the sample with 16O into the metallic ferromagnetic phase. It confirms that different transport and magnetic properties of the samples with 16O and 18O at low temperature are driven by the different oxygen atoms dynamics solely. Temperature dependencies of the CO and AFM diffraction peak intensities and of the peak widths for compositions close to the metal-insulator boundary (y ≈ 0.75) indicate the macroscopically phase separated AFM-dielectric + FM-metallic state below TFM.

Original languageEnglish
Pages (from-to)215-223
Number of pages9
JournalEuropean Physical Journal B
Volume19
Issue number2
DOIs
Publication statusPublished - Jan 2 2001

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Oxygen Isotopes
oxygen isotopes
Isotopes
Cations
Substitution reactions
isotopes
Crystal structure
Positive ions
substitutes
cations
crystal structure
Oxygen
atomic force microscopy
Metal insulator boundaries
Temperature
temperature
diffraction
structural analysis
atomic structure
frequency modulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Balagurov, A. M., Pomjakushin, V. Y., Sheptyakov, D. V., Aksenov, V., Babushkina, N. A., Belova, L. M., ... Kaul, A. R. (2001). Evolution of (La1-yPry)0.7Ca0.3MnO3 crystal structure with A-cation size, temperature, and oxygen isotope substitution. European Physical Journal B, 19(2), 215-223. https://doi.org/10.1007/s100510170330

Evolution of (La1-yPry)0.7Ca0.3MnO3 crystal structure with A-cation size, temperature, and oxygen isotope substitution. / Balagurov, A. M.; Pomjakushin, V. Yu; Sheptyakov, D. V.; Aksenov, V.; Babushkina, N. A.; Belova, L. M.; Gorbenko, O. Yu; Kaul, A. R.

In: European Physical Journal B, Vol. 19, No. 2, 02.01.2001, p. 215-223.

Research output: Contribution to journalArticle

Balagurov, AM, Pomjakushin, VY, Sheptyakov, DV, Aksenov, V, Babushkina, NA, Belova, LM, Gorbenko, OY & Kaul, AR 2001, 'Evolution of (La1-yPry)0.7Ca0.3MnO3 crystal structure with A-cation size, temperature, and oxygen isotope substitution', European Physical Journal B, vol. 19, no. 2, pp. 215-223. https://doi.org/10.1007/s100510170330
Balagurov, A. M. ; Pomjakushin, V. Yu ; Sheptyakov, D. V. ; Aksenov, V. ; Babushkina, N. A. ; Belova, L. M. ; Gorbenko, O. Yu ; Kaul, A. R. / Evolution of (La1-yPry)0.7Ca0.3MnO3 crystal structure with A-cation size, temperature, and oxygen isotope substitution. In: European Physical Journal B. 2001 ; Vol. 19, No. 2. pp. 215-223.
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abstract = "The atomic structure of (La1-yPry)0.7Ca0.3MnO3 compound with 0.5 ≤ y ≤ 1 has been systematically studied by neutron powder diffraction in the temperature range from 15 to 293 K. For composition with y = 0.75, the structural analysis was performed on two samples, one containing the natural mixture of oxygen isotopes and the other one 75{\%} enriched by 18O. The room temperature structural characteristics of the series, including cell volume, average Mn-O bond distance, and average Mn-O-Mn bond angle, are the linear functions of the 〈rA〉. Temperature dependencies of these parameters are quite smooth, except for the point T = TFM, where a jump like changes occur. The isotope enriched samples have been found identical in crystal and magnetic structure down to the temperature of transition of the sample with 16O into the metallic ferromagnetic phase. It confirms that different transport and magnetic properties of the samples with 16O and 18O at low temperature are driven by the different oxygen atoms dynamics solely. Temperature dependencies of the CO and AFM diffraction peak intensities and of the peak widths for compositions close to the metal-insulator boundary (y ≈ 0.75) indicate the macroscopically phase separated AFM-dielectric + FM-metallic state below TFM.",
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