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]

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1999.8400· OSTI ID:6068122

Li, R K ^[1]; Kremer, R; Maier, J ^[2]

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1. Max-Planck-Inst. fuer Festkoerperforschung, Stuttgart (Germany) Univ. of Science and Technology of China, Hefei, Anhui (China)
2. 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: 6068122
• Journal Information: Journal of Solid State Chemistry, Vol. 146:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT OXIDES
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
FERROMAGNETISM
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
STRONTIUM OXIDES
X-RAY DIFFRACTION
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COBALT COMPOUNDS
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
INFORMATION
MAGNETISM
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties