Copper-Oxide Superconductors as Mixed-Valence Heavy Fermions: Spin-Fluctuation Mechanism of Superconductivity

1988 ◽  
Vol 57 (3) ◽  
pp. 722-725 ◽  
Author(s):  
Kazumasa Miyake ◽  
Tamifusa Matsuura ◽  
Kazuhiro Sano ◽  
Yosuke Nagaoka
Keyword(s):  
Copper Oxide ◽  
Spin Fluctuation ◽  
Heavy Fermions ◽  
Mixed Valence ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors ◽  
Mechanism Of Superconductivity

THE CHEMICAL, NEGATIVE-U APPROACH TO HIGH TEMPERATURE SUPERCONDUCTIVITY

1989 ◽  
Vol 03 (05) ◽  
pp. 691-710 ◽  
Author(s):  
JOHN A. WILSON
Keyword(s):  
Copper Oxide ◽  
High Temperature Superconductivity ◽  
Spin Fluctuation ◽  
Mixed Valence ◽  
Neutron Spin ◽  
Oxide Superconductors ◽  
Anderson Transition ◽  
Photoemission Data ◽  
Copper Oxide Superconductors ◽  
High Level

Data published over the past year is examined in the light of the on-site negative U modelling proposed earlier. The model emphasizes how one must proceed beyond mixed valence to consider closely the charge transfer fluctuation conditions between the two subsystems. The situation prevailing is an intermediate U situation, being one in proximity to the Mott-Anderson transition. The high level of p-d mixing, in the copper oxide superconductors is seen to favour charge- at the expense of spin-fluctuation mediation. The proposed mixed-valently seeded, disproportionation fluctuation induced pairing requires no modification to pass from discussion of the copper oxide to the bismuth oxide superconductors. The author continues to express his opinion that it is the photoemission data which are primarily being misinterpreted, thereby encouraging misinterpretation of the neutron spin scattering and related experiments, and continuing to attract many theorists towards various spin modellings of HTSC.

Correlation in Metallic Copper Oxide Superconductors: How Large is it?

1990 ◽  
pp. 463-473
Author(s):  
W. E. Pickett ◽  
H. Krakauer ◽  
R. E. Cohen ◽  
D. Singh ◽  
D. A. Papaconstantopoulos
Keyword(s):  
Copper Oxide ◽  
Metallic Copper ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors
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