Superconductivity and Electronic Structure of SrxLa2-xCuO4-y Prepared under Reducing Condition
- 1 April 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (4A), L463-465
- https://doi.org/10.1143/jjap.26.l463
Abstract
The compound Sr x La2-x CuO4-y (x∼0.7, y∼1.0) with a tetragonal K2NiF4 structure prepared under reducing conditions showed a high superconducting transition temperature (T c) of 37.0 K and T co (the onset of T c ) of 54.0 K. Its photomission spectrum showed the existence of a large amount of monovalent Cu ions and a small amount of bivalent Cu ions. The valence band spectrum has a strong resemblance to the semimetallic DOS (the density of states) of ZrC and has a small DOS at the Fermi level. These facts suggest the T c enhancement from a plasmon or exciton origin due to the Cu d-hole creation and anihilation resonating with vibration modes of the CuO6 and CuO5 clusters.Keywords
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