Abstract
A complex phase diagram for the strontium-doped 214 lanthanum-copper-oxide superconductive system is systematically developed and interpreted. It is argued that below 300 K the superconductive phase is thermodynamically distinguishable from both the antiferromagnetic parent compound and the overdoped metallic phase. The mobile holes introduced by oxidation of the copper-oxide sheets form unconventional polarons characterized by covalent bonding within a polaron and ionic bonding without; molecular-orbital (MO) states inside a polaron are coupled vibronically to localized copper states without. Below 300 K, the polaron gas is unstable relative to the formation of a distinguishable normal state consisting of coupled polarons having extended vibronic states with a Fermi surface near the locus predicted by band theory, but with a band splitting at the half-band position.
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© 1994 Springer Science+Business Media Dordrecht
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Goodenough, J.B. (1994). The System La2-xSrxCuO4 . In: Kaldis, E. (eds) Materials and Crystallographic Aspects of HTc-Superconductivity. NATO ASI Series, vol 263. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1064-8_8
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DOI: https://doi.org/10.1007/978-94-011-1064-8_8
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