Effect of crystal symmetry on O′-phase weak ferromagnetism

H. C. Ku, H. M. Luo, B. N. Lin, Y. P. Chi, Y. Y. Hsu, Y. P. Sun, T. J. Lee

研究成果: 雜誌貢獻文章同行評審

2 引文 斯高帕斯(Scopus)


Correlation between copper weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order and structural symmetry of the Gd2-xRxCuO4 (R = Eu and Tb) systems is reported. With smaller rare earth ions, lattice mismatch between (Gd, R)2 O2 and CuO2 layers results in a small oxygen distortion in square CuO2 plane. The distortion lowers the crystal symmetry from tetragonal T′- to an orthorhombic O′-phase. The weak ferromagnetism is a direct result of such a non-180° α(Cu-O-Cu) coupling with CAF alignment and a WF saturation moment ms(Cu2+) = μ(Cu2+) sin θ, with canting angle θ = (π - α)/2. Magnetic and crystallographic data indicate that the magnetic moment m(T) and the canting angle θ decrease (increase) with larger (smaller) ion doping.

頁(從 - 到)1373-1374
期刊Physica B: Condensed Matter
出版狀態已發佈 - 2000 一月 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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