Abstract
This study investigates the effect of heterovalent, substitutional disorder on the binding energy of La2−xSrxCuO4. First, disorder has been found to create crystal electric fields that fluctuate over different lattice sites and induce ionic dipole moments of varying strength and orientation. The strength of these random dipoles will be presented for increasingx. Second, disorder may slightly displace the ions from their average lattice sites. The large thermal parameters obtained from diffraction experiments are discussed in this context. Finally, the polarization energy related to random dipoles was calculated to be on the order of eV and favourizes the positive charge carriers introduced by Sr doping to be associated with the copper ions. It is concluded that the solid exists in a state containing mixed copper valencies (Cu2+/Cu3+).
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Birkholz, M., Rudert, R. Substitutional disorder, random dipoles and the binding energy of orthorhombic La2−xSrxCuO4 . Z. Physik B - Condensed Matter 98, 49–54 (1995). https://doi.org/10.1007/BF01318278
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DOI: https://doi.org/10.1007/BF01318278