Abstract
The crystal structure of ${\mathrm{Ca}}_{2+x}{\mathrm{Y}}_{2\ensuremath{-}x}{\mathrm{Cu}}_{5}{\mathrm{O}}_{10}$ consists solely of one-dimensional copper-oxygen chains made from ${\mathrm{CuO}}_{4}$ squares sharing edges. Over the range of $x$ between 0 and 2, here synthesized using high-pressure oxygen annealing, formal copper valences between 2 and 2.4 can be obtained. All the members of the series are electrically insulating. Magnetization measurements show long-range antiferromagnetic ordering near $x=0,$ with decreasing ${T}_{N}$ on increasing $x,$ and the appearance of a new kind of short-range-ordered state for $x$ greater than 1.5. The high hole concentration regime represents the first observation of the magnetic and transport properties of a mixture of Zhang-Rice singlets and magnetic copper on one-dimensional chains without the complication of additional copper-oxygen units, and may be an excellent model system for studying their spin and charge dynamics as a key to understanding the behavior of ${\mathrm{CuO}}_{2}$ planes in copper oxide superconductors.
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