Apex oxygen and critical temperature in copper oxide superconductors: Universal correlation with the stability of local singlets

1991 ◽  
Vol 43 (4) ◽  
pp. 2968-2982 ◽  
Author(s):  
Y. Ohta ◽  
T. Tohyama ◽  
S. Maekawa
Keyword(s):  
Critical Temperature ◽  
Copper Oxide ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors ◽  
The Stability ◽  
Universal Correlation ◽  
Apex Oxygen

ELASTIC STRAINS AND ENHANCED CRITICAL TEMPERATURE IN COPPER OXIDE SUPERCONDUCTORS

1988 ◽  
Vol 02 (05) ◽  
pp. 1095-1100 ◽  
Author(s):  
Francisco Guinea
Keyword(s):  
Critical Temperature ◽  
Copper Oxide ◽  
Strong Dependence ◽  
Lattice Parameters ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors ◽  
Lattice Distortions ◽  
Coherence Lengths ◽  
Elastic Strains

The strong dependence of the critical temperature on the lattice parameters, and the existence of short coherence lengths in copper oxide superconductors make possible the appearance of regions with enhanced values of Tc near lattice distortions. Simple estimates show that this enhancement can be comparable to Tc itself near dislocations and other defects.

MINIMAL ANOMALOUS OCCUPANCY IN HIGH-Tc SUPERCONDUCTIVITY

1993 ◽  
Vol 07 (24n25) ◽  
pp. 1601-1609 ◽  
Author(s):  
R.M. MÉNDEZ-MORENO ◽  
M. MORENO ◽  
S. OROZCO ◽  
M.A. ORTÍZ
Keyword(s):  
Critical Temperature ◽  
Copper Oxide ◽  
Cuprate Superconductors ◽  
Normal Limit ◽  
Good Description ◽  
Energy Scale ◽  
Oxide Superconductors ◽  
High Tc ◽  
Copper Oxide Superconductors ◽  
Fermion Gas

A study of a minimal anomalous occupancy is carried out when a small gap occurs near the Fermi surface. A limit which tends softly to the normal occupancy can be introduced. This framework is applied to a quasi-bidimensional fermion gas which can mimick the copper oxide planes in cuprate superconductors. The energy scale implied by this minimally anomalous occupancy (the soft normal limit) for high-T c cuprate superconductors is of the order of the Debye energy. Yet this anomalous occupancy framework overcomes the phonon barrier and a good description for the critical temperature of a representative set of high-T c copper oxide superconductors is obtained.

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