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• W2069769884 abstract "Resistivity of cold-pressed CrO2 powder has been measured over the temperature range of 2 to 350 K with a magnetic field up of to 50 kOe. High resolution transmission electron microscopy (HRTEM) images show that the CrO2 particles are needle-shaped with an aspect ratio of 7:1 and have an average length of 200 nm, and are covered with an ultra-thin (∼2.5 nm) native Cr2O3 layer. Temperature dependent conductivity can be well described by the expression below 55 K, a feature of electron tunneling, and by the higher-order hopping for temperature above 55 K. The magnetoresistance, , reaches ∼33.5% at 2 K and decreases to nearly zero at room temperature. Temperature dependent saturation magnetization follows well the relation below 240 K. The spin-wave stiffness constant, D, is estimated to be ∼91 meV Å2. By fitting the specific heat measured in the temperature range of 1.8–34 K by the relation , we obtained the electronic specific heat coefficient γ = 1.7 mJ/mol K2, this corresponds to a density of states at the Fermi level of 0.73 states/eV, which is in good accordance with the theoretical value of 0.69 states/eV." @default.
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• W2069769884 date "2005-01-01" @default.
• W2069769884 modified "2023-10-01" @default.
• W2069769884 title "Transport and magnetotransport properties of cold-pressed CrO2 powder" @default.
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• W2069769884 doi "https://doi.org/10.1002/pssa.200406912" @default.
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