Crystal and magnetic structural study of the La1-xCaxMnO3 compound (x=34)

M. Pissas, I. Margiolaki, K. Prassides, E. Suard

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30 Citations (Scopus)

Abstract

We studied the crystal and magnetic structure of the La14Ca34MnO3 compound using ultrahigh resolution synchrotron x-ray and neutron-diffraction techniques. The experimental results revealed that the particular compound undergoes a structural transition at TCO=220K. This transition results in an increase of the orthorhombic splitting and the appearance of superlattice diffraction peaks, which can be indexed assuming a supercell 4a (a is the unit cell parameter for T>TCO). This transition is reminiscent of those observed for the x=12 and x=23 stoichiometries where superstructures with 2a and 3a, respectively, have been observed. At TN=160K the neutron-diffraction patterns exhibit additional diffraction peaks, corresponding to antiferromagnetic long-range order with propagation vectors k=[14,0,12] and k=[12,0,12]. In addition to the structural transition at TCO the synchrotron high resolution x-ray diffraction patterns revealed a three phase coexistence.

Original languageEnglish
Article number064426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number6
DOIs
Publication statusPublished - 2005 Aug 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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