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Evidence of magnetic mechanism for cuprate superconductivity
Amit Keren 2009 New J. Phys. 11 065006 (17pp)   doi: 10.1088/1367-2630/11/6/065006

The electronic structure and superexchange interactions in transition-metal compounds

Abstract. The authors discuss the electronic structure of transition-metal compounds in light of a new theoretical approach using an Anderson impurity Hamiltonian. They arrive at conclusions concerning the magnitude of parameters such as the d-d Coulomb interaction (U) and the charge-transfer energy ( Delta ) for the transition-metal monoxides, based on theoretical calculations of the band gaps, the optical spectra photoelectron and inverse-photoelectron spectral shapes, and comparison with experiment. They find that both Delta and U are large but comparable in magnitude. The implications for superexchange interactions are discussed and the authors show that the observed trends in the Neel temperatures are now well described, whereas the traditional Anderson approach gave a qualitatively different trend

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