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Title: Glassy magnetic behavior induced by Cu2+ substitution in the frustrated antiferromagnet ZnCr2O4
Author: Yan, Li-qin
Macià Bros, Ferran
Jiang, Zhong-wei
Shen, Jun
He, Lun-hua
Wang, Fang-wei
Keywords: Transformacions de fase (Física estadística)
Propietats magnètiques
Phase transformations (Statistical physics)
Magnetic properties
Issue Date: 19-May-2008
Publisher: IOP Publishing
Abstract: The structure and magnetic properties of the compounds Zn 1-xCuxCr2O4 (ZCCO) are investigated systematically. A structural phase transition from space-group symmetry Fd3m to I41/amd is observed in ZCCO. The critical value of the doping, x, appears at 0.58-0.62 through the appearance of a splitting of diffraction peaks at room temperature. Measurements of dc magnetization, ac susceptibility, memory effect and exchange-bias-like (EB-like) effect have been performed to reveal the glassy magnetic behaviors of ZCCO. The system with x≤0.50 suggests a spin glass-like (SG-like) magnetic characterization whereas doping values of 0.58≤x≤0.90 define the system as 'cluster-glass-like' (CG-like) with unidirectional anisotropy. The Cu content suppresses the geometrical frustration of ZnCr2O4, which may correlate with the pinning effect of the Cu sublattice on the Cr sublattice to a preferential direction
Note: Versió postprint del document publicat a:
It is part of: Journal of Physics: Condensed Matter, 2008, vol. 20, num. 25, p. 255203
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ISSN: 0953-8984
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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