Anomalous crystal-structure distortion at the antiferromagnetic transition in the layered cobalt oxide Sr2Y0.8Ca0.2Co2O6

K. Yamaura, Q. Huang, R. W. Erwin, J. W. Lynn, R. J. Cava

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Abstract

The temperature-dependent crystal structure and magnetic structure of the layered Ruddlesden-Popper phase Sr2Y0.8Ca0.2Co2O6are reported. The crystal structure is orthorhombic below 270 K [Immm; a=3.84029(7)Å, b=3.80691(6)Å, and c=19.4980(3)Å at 20 K], transformed from tetragonal [I4/mmm; a=3.82765(6)Å, and c=19.5795(3)Å at 295 K]. The crystal structure distortion is accompanied by an anomalous temperature dependence of the degree of buckling of the CoO2plane and is correlated with the development of anisotropic antiferromagnetic ordering of magnetic moments [2.93(2)μBper Co at 20 K].

Original languageEnglish (US)
Pages (from-to)9623-9629
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number13
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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