Properties of high-temperature superconductors in a two-band model with the doping-dependent electron spectrum

2001 ◽  
Vol 50 (3) ◽  
pp. 169
Author(s):  
N Kristoffel ◽  
P Rubin
Keyword(s):  
High Temperature ◽  
Electron Spectrum ◽  
High Temperature Superconductors ◽  
Band Model ◽  
Two Band Model

High-temperature superconductivity of perovskites in a two-band model

1993 ◽  
Vol 144 (1) ◽  
pp. 83-90 ◽  
Author(s):  
P. Konsin ◽  
N. Kristoffel ◽  
T. Örd
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Band Model ◽  
Two Band Model

scholarly journals A Schematic Two Overlapping-Band Model for Superconducting Sulfur Hydrides: The Isotope Mass Exponent

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
R. M. Méndez-Moreno
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Fermi Surface ◽  
Coupling Parameter ◽  
High Temperature Superconductors ◽  
Band Model ◽  
Intermediate Coupling ◽  
Electronic Density ◽  
Knowing That ◽  
Multicomponent Model

The high value of the isotope shift in sulfur hydrides supports a phonon-mediated pairing scenario of superconductivity for these high-temperature superconductors which are consistent with the Bardeen–Cooper–Schrieffer (BCS) framework. Knowing that a large electronic density of states enhances the critical temperature (Tc), generalized Fermi surface topologies are used to increase it. A multicomponent model within the BCS framework is proposed in this work for sulfur hydride superconductors. This model is used to evaluate some properties of the H3S superconductor. Strong and intermediate coupling effects are taken into account with the effective McMillan approximation, and the isotope coefficient is evaluated as a function of the coupling parameter as well as other relevant parameters of the model.

Two-band model for high-temperature superconductivity

1994 ◽  
Vol 17 (9) ◽  
pp. 1-41 ◽  
Author(s):  
N. Kristoffel ◽  
P. Konsin ◽  
T. Örd
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Band Model ◽  
Two Band Model

THE TEMPERATURE DEPENDENCE OF THE NORMAL STATE SPIN SUSCEPTIBILITY IN HIGH TEMPERATURE SUPERCONDUCTORS

1992 ◽  
Vol 06 (28) ◽  
pp. 1765-1783 ◽  
Author(s):  
R. DUPREE ◽  
Z.P. HAN
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Normal State ◽  
High Temperature Superconductors ◽  
Quantum Spin ◽  
Spin Susceptibility ◽  
Band Model ◽  
Hole Density ◽  
Temperature Dependences ◽  
State Spin

The static spin susceptibility in high-temperature superconductors can be accurately determined by Nuclear Magnetic Resonance (NMR) measurements which show that it has a systematic doping and temperature dependence in the normal state. The similarity in the temperature dependence of the 89Y, 63Cu and 17O Knight shifts for YBa2Cu3O7−δ as well as for YBa2Cu4O8 demonstrate that all of them probe the same spin susceptibility, Xs(T). This provides strong evidence in favor of the one-band model in which the Cu 3d and O 2p orbitals hybridize strongly and form a single quantum spin fluid in the Cu−O plane. Furthermore, recent NMR work has revealed a common behavior in the underdoped regime: similar magnitudes and temperature dependences of Xs(T) in different double layered superconducting cuprates are related to their similar Tc, suggesting a strong correlation between Tc, the hole density and the spin susceptibility. Possible explanations of the common behavior as well as the systematic doping and temperature dependence of the spin susceptibility in high-Tc cuprates are discussed.

High-Temperature Transport Properties of Palladium

1972 ◽  
Vol 50 (3) ◽  
pp. 196-205 ◽  
Author(s):  
M. J. Laubitz ◽  
T. Matsumura
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Large Deviations ◽  
Thermoelectric Power ◽  
The Other ◽  
Band Model ◽  
Experimental Systems ◽  
Two Band Model ◽  
Pure Palladium

The thermal conductivity, electrical resistivity, and absolute thermoelectric power of pure palladium have been determined from 90 to 1300 K in two experimental systems of proven reliability. These properties are compared with the sparse available literature data, and show large deviations from them, particularly for the thermal conductivity at high temperatures. The results are also analyzed in terms of a simple two-band model, where one band contains the carriers, and the other acts as a trap into which phonons scatter the carriers. When the recent density of states values of Mueller et al. are used, the model predicts correctly the temperature variation of the electrical resistivity, and reasonably well its observed magnitude and the observed Wiedemann–Franz ratio. However, the model fails badly in respect to the absolute thermoelectric power, predicting values twice as large as the observed ones. Modifications to the model are suggested which may improve the fit between the predicted and observed values.

Two-band model of the electron spectrum in n-Bi/sub 2/Te/sub 2.7/Se/sub 0.3/

2005 ◽  
Author(s):  
P.P. Konstantinov ◽  
L.V. Prokofieva ◽  
M.I. Fedorov ◽  
D.A.P. Severin ◽  
Yu.I. Ravich ◽  
...  
Keyword(s):  
Electron Spectrum ◽  
Band Model ◽  
Two Band Model
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