Electron magnetic resonance, neutron diffraction and ac susceptibility study of CaMn 1-x Ru{ x O 3 (x < 0.40) manganite system

A. I. Shames, E. Rozenberg, C. Martin, A. Maignan, B. Raveau, G. André, G. Gorodetsky

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Electron magnetic resonance (EMR), neutron powder diffraction (NPD) and ac susceptibility techniques were employed for studying the crystallographic structure and magnetic ordering in CaMn 1-xRu xO 3 (x < 0.40) manganite system. EMR measurements were done on polycrystalline samples at 120 < T < 500 K. High temperature EMR spectra of pristine antiferromagnetic (AFM) CaMnO 3 show a singlet Lorentzian-like line, whose intensity diminishes, zeroing at Neel temperature T N=120 K. Strong broadening of paramagnetic (PM) lines with increase of Ru-content (Δ H pp ∼ 1 T for x=0.10) was found. Upon cooling low-doped (x ≤ 0.06) samples remain AFM, whereas higher doped ones (0.10 ≤ x ≤ 0.40) clearly show progressive appearance of ferromagnetic (FM) phases. Thus, EMR evidences that Ru-doping modifies both PM and AFM states and creates an inhomogeneous phase separated FM and AFM ground states at x0.06. Complementary measurements of NPD and ac susceptibility corroborate the complex character of magnetic ordering, revealed by EMR. The changes of the magnetic ordering in CaMn 1-xRu xO 3 supposed to be solely determined by doping of Mn-sites with Ru.

Original languageEnglish
Pages (from-to)99-103
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume20
Issue number2 SPECIAL ISSUE
DOIs
StatePublished - 1 Feb 2007
Externally publishedYes

Keywords

  • Doped manganites
  • Ferromagnetic and electron paramagnetic resonance
  • Neutron powder diffraction
  • Phase separation
  • ac magnetic susceptibility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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