The structure and weak ferromagnetism of the double layered cuprocobaltate: Y{sub 2}SrCu{sub 0.6}Co{sub 1.4}O{sub 6.5}
- Max-Planck-Inst. fuer Festkoerperforschung, Stuttgart (Germany)
Rietveld refinement of the X-ray powder diffraction (XRPD) pattern confirms that Y{sub 2}SrCu{sub 0.6}Co{sub 1.4}O{sub 6.5} is isostructural to Y{sub 2}SrCuFeO{sub 6.5}. Unlike its Fe-analog which is antiferromagnetic, Y{sub 2}SrCu{sub 0.6}Co{sub 1.4}O{sub 6.5} behaves as a three-dimensional (3D) ferromagnetic below {Tc} = 385 K with a spontaneous magnetic moment per formula unit of only {mu}{sub s} = 0.07{mu}{sub B} extrapolated to T = 0 K. The authors concluded that this weak ferromagnetism (WFM) originates from Dzyaloshinsky-Moriya (D-M) spin canting mechanism based on the observation of T{sup 2} dependence of the low-temperature magnetization. The electrical resistance of sintered samples shows an exponential dependence on temperature expo(T{sub 0}/T){sup {alpha}} with {alpha} = 1/2 in the 185--570 K temperature range, which indicates the conduction mechanism is within variable range hopping (VRH) regime with long-range Coulomb interaction between the carriers. Y{sub 2}SrCu{sub 0.6}Co{sub 1.4}O{sub 6.5} does not show any significant magneto-resistance effect in the 200--400 K temperature range.
- OSTI ID:
- 696680
- Journal Information:
- Journal of Solid State Chemistry, Vol. 146, Issue 2; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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