Hole distribution and madelung energy in the high-Tc oxide superconductors |
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Authors: | L F Feiner and D M de Leeuw |
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Institution: | Philips Research Laboratories, P.O. Box 80.000, 5600 JA, Eindhoven, The Netherlands |
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Abstract: | Evidence is presented that in high-Tc superconductors the electrostatic interaction as expressed by the Madelung energy is the key factor in determining the charge distribution and in particular the distribution of the holes between the CuO2-planes and other structural subunits. Specifically, this explains the phase diagram (Tc as a function of oxygen content and oxidizing power) of cation-substituted YBa2Cu3O6+y and the oxygen ordering in YBa2Cu3O6.5. Moreover, we argue that the dependence of Tc on strontium content in La2−xSrxCuO4 is similarly due to the fact that holes go into the (La,Sr)O-sheets as well as into the CuO2-planes. |
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