Interplay between itinerant and localized states in CaMn1-x Rux O3 (x≤0.5) manganites

V. Markovich, M. Auslender, I. Fita, R. Puzniak, C. Martin, A. Wisniewski, A. Maignan, B. Raveau, G. Gorodetsky

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15 Scopus citations

Abstract

Magnetic properties of polycrystalline CaMn1-x Rux O3 (x=0-0.5) samples were investigated in the temperature range 4.2-250 K, under external magnetic field up to 15 kOe and under hydrostatic pressure up to 12 kbar. Transport properties of the samples with x=0.1, 0.2, 0.4, 0.5 were also investigated under pressure up to 10 kbar. For x up to 0.4, the pressure was found to suppress ferromagnetic correlations and to increase the resistivity, while for x=0.5 to act in the opposite way. While long ferromagnetic order is completely suppressed, in small clusters ferromagnetic correlations probably survive under pressure, as was revealed for CaMn0.9 Ru0.1 O3. The pressure effect on the magnetic interactions and on the volume of ferromagnetic phase was found to depend strongly on the Ru content, and absolute value of the pressure coefficient of spontaneous magnetization was found to decrease practically linearly with increasing x in the range 0.1<x<0.5. The experimental data are discussed in the frame of proposed energy-level diagram, which includes magnetoimpurity states at low and moderate Ru content and mixed-valence states of Ru presented by a strongly correlated t2g -like band at heavy Ru doping. An impact of disorder introduced by Ru doping on the energy diagram and on derived magnetic interactions is discussed. Predictions of the model regarding the pressure effects on conductivity and temperature scales characteristic for magnetic interactions are in reasonable agreement with experiment.

Original languageEnglish
Article number014416
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number1
DOIs
StatePublished - 27 Feb 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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