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.

scholarly journals ELECTRONIC BOUND STATES IN PARITY-PRESERVING QED3 APPLIED TO HIGH-Tc CUPRATE SUPERCONDUCTORS

2003 ◽  
Vol 18 (05) ◽  
pp. 725-741 ◽  
Author(s):  
H. R. CHRISTIANSEN ◽  
O. M. DEL CIMA ◽  
M. M. FERREIRA ◽  
J. A. HELAYËL-NETO
Keyword(s):  
Bound States ◽  
Cuprate Superconductors ◽  
Energy Scale ◽  
Spontaneous Breaking ◽  
Electron Interaction ◽  
Oxide Superconductors ◽  
S Wave ◽  
High Tc ◽  
Pair Condensation ◽  
Copper Oxide Superconductors

We consider a parity-preserving QED 3 model with spontaneous breaking of the gauge symmetry as a framework for the evaluation of the electron–electron interaction potential underlying high-T c superconductivity. The fact that the resulting potential, -CsK0(Mr), is non-confining and "weak" (in the sense of Kato) strongly suggests the mechanism of pair-condensation. This potential, compatible with an s-wave order parameter, is then applied to the Schrödinger equation for the sake of numerical calculations, thereby enforcing the existence of bound states. The results worked out by means of our theoretical framework are checked by considering a number of phenomenological data extracted from different copper oxide superconductors. The agreement may motivate a deeper analysis of our model viewing an application to quasiplanar cuprate superconductors. The data analyzed here suggest an energy scale of 1–10 meV for the breaking of the U(1)-symmetry.

ANOMALOUS FERMIONIC OCCUPANCY FOR HIGH-Tc SUPERCONDUCTING LAYERED MATERIALS

1992 ◽  
Vol 06 (15) ◽  
pp. 935-942 ◽  
Author(s):  
G. CARMONA ◽  
R. M. MÉNDEZ-MORENO ◽  
S. OROZCO ◽  
M. A. ORTÍZ ◽  
M. MORENO ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Cuprate Superconductors ◽  
Good Description ◽  
Layered Materials ◽  
High Tc ◽  
Infinite Slab ◽  
Fermion Pairs

Tighter-bound Cooper fermion pairs are obtained in a model with anomalous occupancy for fermions confined to an infinite slab mimicking the copper-oxide planes in cuprate superconductors. The model is applied to several typical high T c superconductors. T c values in this model are higher than those obtained with normal occupancy. Small but nonzero values for the anomalous occupancy parameter give a remarkably good description of the data.

Some Effects of Chemical Substitution and Applied Pressure on High Tc Copper Oxide Superconductors

1988 ◽  
pp. 29-40 ◽  
Author(s):  
M. B. Maple ◽  
Y. Dalichaouch ◽  
E. A. Early ◽  
B. W. Lee ◽  
J. T. Markert ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Applied Pressure ◽  
Oxide Superconductors ◽  
High Tc ◽  
Chemical Substitution ◽  
Copper Oxide Superconductors

Possibility of cubic copper-oxide superconductors with high Tc

1991 ◽  
Vol 185-189 ◽  
pp. 1567-1568 ◽  
Author(s):  
H. Ihara ◽  
K. Bushida ◽  
N. Terada ◽  
S. Ishibashi ◽  
G. Zouganelis ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Oxide Superconductors ◽  
High Tc ◽  
Copper Oxide Superconductors
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