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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1373-1374
Number of pages2
JournalPhysica B: Condensed Matter
Volume284-288
Issue numberPART II
DOIs
Publication statusPublished - 2000 Jan 1

Keywords

  • GdRCuO
  • O'-phase
  • Weak ferromagnetism

ASJC Scopus subject areas

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

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  • Cite this

    Ku, H. C., Luo, H. M., Lin, B. N., Chi, Y. P., Hsu, Y. Y., Sun, Y. P., & Lee, T. J. (2000). Effect of crystal symmetry on O′-phase weak ferromagnetism. Physica B: Condensed Matter, 284-288(PART II), 1373-1374. https://doi.org/10.1016/S0921-4526(99)02514-4