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            <title xml:lang="en">Measurement of the phase diagram of (Y1-yCay)Ba2Cu3O6 versus calcium content. Evidence for the importance of charge dynamics in the destruction of TN</title>
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                <title xml:lang="en">Measurement of the phase diagram of (Y1-yCay)Ba2Cu3O6 versus calcium content. Evidence for the importance of charge dynamics in the destruction of TN</title>
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                <term xml:lang="en">High temperature superconductors</term>
                <term xml:lang="en">Yttrium calcium barium copper oxides</term>
                <term xml:lang="en">Oxide superconductors</term>
                <term xml:lang="en">AC susceptibility</term>
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              <p>We have determined the phase diagram of (Y1-yCay)Ba2Cu3O6 by measuring TN with 89Y NMR and Tc by AC susceptibility. As in the (La2-xSrx)CuO4 system, the introduction of holes in the CuO2 planes is via heterovalent substitution, giving direct control over the number of holes doped. Similar to (La2-xSrx)CuO4, it is found that the (Y1-yCay)Ba2Cu3O6 phase diagram has, with increasing Ca content, an AF phase (0≤y≤0.07) and a superconducting phase (y≥0.2) separated by an intermediate region. A description of TN versus hole content is proposed where the charge dynamics play a major role. A fit to the data is made using this model resulting in a qualitatively correct curve for low and intermediate doping. An argument for the importance of the planar anisotropy, Jxy, of the CuCu superexchange interaction, J, in the appearance of 3D long range order at finite T is given in the discussion.</p>
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