Anomalous isotope effect due to linear-energy-dependent electronic density of states in high-Tc superconductors

1993 ◽  
Vol 85 (4) ◽  
pp. 341-342 ◽  
Author(s):  
Biao Hao ◽  
Chang-de Gong
Keyword(s):  
Isotope Effect ◽  
Density Of States ◽  
High Tc Superconductors ◽  
Electronic Density ◽  
High Tc ◽  
Electronic Density Of States ◽  
Energy Dependent

Free energy formula for a strong coupling superconductor with energy dependent electronic density of states

1983 ◽  
Vol 61 (6) ◽  
pp. 872-887 ◽  
Author(s):  
B. Mitrovic ◽  
J. P. Carbotte
Keyword(s):  
Free Energy ◽  
Density Of States ◽  
Impurity Scattering ◽  
Energy Difference ◽  
Critical Magnetic Field ◽  
Half Width ◽  
Electronic Density ◽  
Electronic Density Of States ◽  
Strong Coupling Superconductor ◽  
Energy Dependent

Generalized expressions for the free energy difference between normal and superconducting states are derived for the case of an energy dependent (ED) electronic density of states (EDOS) with normal and paramagnetic impurity scattering included. The derivation starts from the Eliashberg expression for the grand thermodynamic potential and ends in explicit formulas for the case of a symmetric Lorentzian model EDOS. Some numerical results are given for the critical magnetic field deviation function and the ratio 2Δ0/kBTc of the Δ0 to the critical temperature Tc. For a peak at the Fermi energy of half width less than the Debye energy (ωD), the modified Eliashberg theory is needed to describe its effect on the thermodynamic properties, whereas for a half width greater than ωD, the corrections to a flat approximation are small.

Thermodynamics of weak coupling anisotropic superconductors with energy dependent electronic density of states

1983 ◽  
Vol 61 (6) ◽  
pp. 825-837 ◽  
Author(s):  
H. G. Zarate ◽  
J. P. Carbotte
Keyword(s):  
Density Of States ◽  
Thermodynamic Functions ◽  
Weak Coupling ◽  
Peak Width ◽  
Significant Modification ◽  
Electronic Density ◽  
Electronic Density Of States ◽  
Anisotropic Superconductors ◽  
Energy Dependent ◽  
Analytical Expressions

We derive analytical expressions for the gap edge and thermodynamic functions of anisotropic weak coupling superconductors with a model energy dependent electronic density of states N (ε). We choose N (ε) to be a Lorentzian superimposed on a constant background with the Fermi energy at an arbitrary distance from the maximum. Significant modification to the Bardeen–Cooper–Schrieffer (BCS) expressions are found for sharp peaks and for valleys in the density of states when the peak width is on the scale of the Debye energy. In this last case corrections can be very important.

scholarly journals Towards novel organic high- Tc superconductors: Data mining using density of states similarity search

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
R. Matthias Geilhufe ◽  
Stanislav S. Borysov ◽  
Dmytro Kalpakchi ◽  
Alexander V. Balatsky
Keyword(s):  
Data Mining ◽  
Density Of States ◽  
Similarity Search ◽  
High Tc Superconductors ◽  
High Tc
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