Variations of ionic binding energies and the distribution of charge carriers in orthorhombic La2−x Sr x CuO4 |
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Authors: | Mario Birkholz Rainer Rudert |
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Affiliation: | 1. Ingenieurbüro für Solartechnik, Offenbacher Strasse 7, D-14197, Berlin, Germany 2. Bundesanstalt für Materialprüfung und-forschung, Rudower Chaussee 5, D-12489, Berlin, Germany
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Abstract: | The significance of heterovalent, substitutional disorder for the distribution of charge carriers in La2?x Sr x CuO4 has been investigated. Disorder is shown to cause strong variations of binding energies of the ions ranging to some eV for Sr contentsx=0.1. Balancing the energy for a hole transport, Cu3++O2?→Cu2++O?, and taking binding energy variations into account, the process is realized to become possible without consuming energy for a subset Θ for allx Cu3+ in one formula unit of La2?x Sr x CuO4. The functions Θ(x) are presented for hole transports to apex and in-plane oxygens, respectively. The delocalization of charge carriers is interpreted to be caused by valency disorder on metal lattice sites. |
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