Abstract
Recently, superconductivity has been reported in copper oxides (Sr,Ca) 14Cu 24O 41 with ladders and edge-sharing chains under pressure. In order to understand the mechanism of superconductivity, it is crucial to clarify the distribution of self-doped holes. From the analysis of the optical conductivity using the ionic model and the exact diagonalization method, we confirm that with substituting Ca for Sr the self-doped holes are transferred from the chains to the ladders. We also examine the electronic states of edge-sharing chains in a variety of copper oxides and derive the effective Hamiltonian. The dependences of the magnetic interactions between Cu ions and of the hopping energies of the Zhang–Rice singlet on the bond angle of Cu–O–Cu are discussed.
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