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Preparation and Magnetic Properties of (La1−x Sr1+x )(Mn0.5Co0.5)O4

  • M. Y. Lin
  • Y. F. Wang
  • D. C. Ling
  • H. S. Sheu
  • H.-C. I. Kao
Original Paper
  • 103 Downloads

Abstract

A series of single phase (La1−x Sr1+x ) (Mn0.5Co0.5)O4 (0≤x≤0.40) materials with a tetragonal K2NiF4 structure was prepared by a solid state reaction method at 1400 or 1450 °C with a short period of heating time. Powder X-ray diffraction (XRD) and the Rietveld refinement method were employed for the structural analysis. Unit cell a- and c-axes decrease with increasing amount of Sr substitution. A discrepancy between the zero-field-cooled and the field-cooled magnetization is observed in all samples investigated below a characteristic temperature, T *, which likely arises from the canted nature of spins or the random freezing of spins. It appears that T * decreases with increasing amount of Sr substitution, which is possibly due to the enhancement of chemical pressure induced by Sr and a corresponding increases of the valence of Mn and/or Co.

Keywords

(La1−xSr1+x)(Mn0.5Co0.5)O4 K2NiF4 Unit cell parameters Paramagnetic Ferromagnetic 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • M. Y. Lin
    • 1
  • Y. F. Wang
    • 2
  • D. C. Ling
    • 2
  • H. S. Sheu
    • 3
  • H.-C. I. Kao
    • 1
  1. 1.Department of ChemistryTamkang UniversityTamsuiTaiwan
  2. 2.Department of PhysicsTamkang UniversityTamsuiTaiwan
  3. 3.National Synchrotron Radiation Research CenterHsinchuTaiwan

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