Abstract
We synthesized new copper-oxychlorides with the T ∗ structure CaR CuO 3 Cl (R= Y, Ho and Er) , using a high pressure technique. X-ray diffraction indicates that samples with nominal compositions of Ca RCuO 3Cl ( R=Y, Ho and Er) have a tetragonal structure with the a-axis lattice parameters in the range 3.84–3.86 Å, which are comparable to those of typical p-type superconductors. Both the a-axis and c-axis lattice parameters decrease approximately linearly with decreasing ion size R. The range cationic radius ratio of alkaline earth and rare earth elements for these copper-oxychlorides agrees with those previously reported for T ∗ copper-oxides and -oxychlorides.
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