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- W1970611704 abstract "${text{Co}}_{2}(text{OH}){text{AsO}}_{4}$ has been prepared by hydrothermal synthesis and characterized from x-ray and neutron powder diffraction. The structure consists of a three-dimensional framework in which $text{Co}(1){text{O}}_{5}$-trigonal bipyramid dimers and $text{Co}(2){text{O}}_{6}$-octahedra chains are simultaneously present. The magnetic structure has been determined by neutron (D2B and D1B) powder-diffraction data. Below 22 K, the ${text{Co}}_{2}(text{OH}){text{AsO}}_{4}$ phase shows an incommensurate antiferromagnetic structure along the $b$ direction. The propagation vector $(0,ensuremath{delta},0)$ is temperature dependent with a value of $ensuremath{delta}=0.430$ at the lowest temperature (1.8 K). Magnetization measurements of ${text{Co}}_{2}(text{OH}){text{AsO}}_{4}$ show a complex magnetic behavior with the presence of three different signals. Between 6 and 21 K, a strong dependence of the magnetic field is observed with a shift of the inflexion point associated to the three-dimensional antiferromagnetic ordered from 18 K at 1 kOe to 20.1 K at 90 kOe. The small splitting observed in the zero-field-cooled-field-cooled curves at low temperatures is characteristic of ferromagnetic interactions but saturation is not reached even up to 90 kOe. Heat-capacity measurements show an unusual dependence on the magnetic field for antiferromagnetic transitions with a jump at the Ne'el temperature quite small (2 J/Kmol). The magnetic contribution exhibits a $ensuremath{lambda}$-type anomaly associated to the three-dimensional antiferromagnetic ordering. Surprisingly, the $ensuremath{lambda}$ anomaly grows with the magnetic field and becomes better defined. Neutron powder diffraction in different fields shows a magnetic phase transition. The incommensurate magnetic structure evolves at low temperatures toward a collinear AF phase for fields higher than 35 kOe." @default.
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- W1970611704 date "2010-04-23" @default.
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- W1970611704 title "Sinusoidal magnetic structure in a three-dimensional antiferromagnetic<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>OH</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mtext>AsO</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: Incommensurate-commensurate magnetic phase …" @default.
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- W1970611704 doi "https://doi.org/10.1103/physrevb.81.134431" @default.
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