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Electronic structure of the high Tc superconductor Ba2YCu3O6.9
Affiliation:1. School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China;2. Shanghai Urban Forest Research Station, National Forestry and Grassland Administration, 800 Dongchuan Rd., Shanghai 200240, China;3. Key Laboratory for Urban Agriculture, Ministry of Agriculture and Rural Affairs, 800 Dongchuan Rd., Shanghai 200240, China;4. Shanghai Academy of Environmental Sciences, 508 Qinzhou Rd., Shanghai 200233, PR China;5. State of Environmental Protection Key Laboratory of the Formation and Prevention of Urban Air Complex, 508 Qinzhou Rd., Shanghai 200233, PR China;6. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China;1. Department of Laboratory Medicine, Zhongnan Hospital of Wuhan University, Wuhan University, No.169 Donghu Road, Wuhan, Hubei, China;2. School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
Abstract:The electronic structure of Ba2YCu3O6.9 has been calculated using the linear augmented-plane-wave method. The results show strongly 2-dimensional and 1-dimensional features in the energy bands. These give rise to competing ch density wave instabilities. We argue that the proximity of these instabilities and the large electron-phonon matrix elements of the Fermi-level electrons make important contributions to the high Tc of this material.
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