Effect of crystal symmetry on O′-phase weak ferromagnetism

H. C. Ku, H. M. Luo, B. N. Lin, Y. P. Chi, Yung-Yuan 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

Fingerprint

Ferromagnetism
Crystal symmetry
ferromagnetism
Ions
Lattice mismatch
symmetry
Magnetic moments
Rare earths
crystals
Copper
ions
rare earth elements
magnetic moments
alignment
Doping (additives)
Oxygen
moments
saturation
copper
oxygen

Keywords

  • GdRCuO
  • O'-phase
  • Weak ferromagnetism

ASJC Scopus subject areas

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

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

Effect of crystal symmetry on O′-phase weak ferromagnetism. / Ku, H. C.; Luo, H. M.; Lin, B. N.; Chi, Y. P.; Hsu, Yung-Yuan; Sun, Y. P.; Lee, T. J.

In: Physica B: Condensed Matter, Vol. 284-288, No. PART II, 01.01.2000, p. 1373-1374.

Research output: Contribution to journalArticle

Ku, HC, Luo, HM, Lin, BN, Chi, YP, Hsu, Y-Y, Sun, YP & Lee, TJ 2000, 'Effect of crystal symmetry on O′-phase weak ferromagnetism', Physica B: Condensed Matter, vol. 284-288, no. PART II, pp. 1373-1374. https://doi.org/10.1016/S0921-4526(99)02514-4
Ku, H. C. ; Luo, H. M. ; Lin, B. N. ; Chi, Y. P. ; Hsu, Yung-Yuan ; Sun, Y. P. ; Lee, T. J. / Effect of crystal symmetry on O′-phase weak ferromagnetism. In: Physica B: Condensed Matter. 2000 ; Vol. 284-288, No. PART II. pp. 1373-1374.
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AU - Luo, H. M.

AU - Lin, B. N.

AU - Chi, Y. P.

AU - Hsu, Yung-Yuan

AU - Sun, Y. P.

AU - Lee, T. J.

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AB - 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.

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