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- W2012147287 abstract "We have found that the (Sr0.4Ca0.6)14Cu24−xCoxO41−δ system shows a metal-insulator transition at Co content x between 4.0 and 4.5 after high-pressure O2 annealing. For the as-sintered samples the T dependence of the electrical resistivities is semionductting over the whole x range and the associated activation energies systematically increase with increasing x. For the high-pressure O2 annealed samples the T dependence of the electrical resistivities is semiconducing, similar to the as-sintered ones at x below 3.8, whereas the electrical resistivities scarcely depend on the temperature variation with two types of small activation energies, ∼ 59 meV (200−100 K) and ∼ 2 meV (100−4.2 K) at x = 4.8. The behaviors of the electrical resistivities are characterized by the one-dimensional variable-range hopping scheme at a low-temperature region. These facts can be interpreted: the hole carriers beyond the capacity of the 1D CuO2 chain for trapping holes are released into the ladder by Co doping x above 2.9 under high-pressure O2 annealing (650°C, 8 MPa, 20 h)." @default.
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- W2012147287 date "1995-12-01" @default.
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- W2012147287 title "Metal-insulator transition in the spin ladder system (Sr0.4Ca0.6)14Cu24−xCoxO41−δ" @default.
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- W2012147287 doi "https://doi.org/10.1016/0921-4534(95)00608-7" @default.
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