Structure-property relationships in a series of mixed layer pnictide oxide compounds: A2Mn3Pn2O2 (A = Sr, Ba; Pn = P, As, Sb)

Stephanie L. Brock, Susan M. Kauzlarich

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Results of magnetic property measurements for the compounds A2Mn3Pn2O2 (A = Sr, Ba; Pn = P, As, Sb) are reported and discussed in the light of structural trends in the series. The structure consists of a 1:1 intergrowth of metal oxide layers in which the metal coordination is square planar and metal pnictide layers in which the coordination is tetrahedral. With the exception of Sr2Mn3As2O2, magnetic susceptibility data reveal the presence of broad maxima that have been assigned to coupling of the MnO2- 2 layers. The data have been fitted assuming a 2D Heisenberg antiferromagnet model and the intraplanar coupling constants obtained are observed to increase as the a parameter or metal oxygen bond length decreases. The same trend is observed for the relationship of transition temperatures, obtained from dχT/dT plots, to the a axial parameters. The exception to the rule is Sr2Mn3As2O2, which has an anomalously low transition temperature and different magnetic behavior for field-cooled versus zero-field-cooled samples. The field-cooled data show a sharp antiferromagnetic transition whereas the zero-field-cooled data show no transition to 3D order between 5 and 300 K.

Original languageEnglish (US)
Pages (from-to)82-88
Number of pages7
JournalJournal of Alloys and Compounds
Volume241
Issue number1-2
StatePublished - Aug 1 1996

Keywords

  • 2D magnetism
  • Antiferromagnetism
  • Layered compounds
  • Pnictide oxide compounds
  • Semiconductivity

ASJC Scopus subject areas

  • Metals and Alloys

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