Dependences of the chemical potential shift and superconducting transition temperature on the hole concentration in La2-xSrxCuO4and Bi2Sr2Ca1-xYxCu2O8+delta

2000 ◽  
Vol 13 (3) ◽  
pp. 301-306 ◽  
Author(s):  
P Konsin ◽  
B Sorkin
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Chemical Potential ◽  
Hole Concentration ◽  
Superconducting Transition ◽  
Potential Shift

SUPERCONDUCTIVITY IN THE NEARLY HALF–FILLED HUBBARD MODEL WITH STRONG ON SITE CORRELATION

1988 ◽  
Vol 02 (05) ◽  
pp. 567-575 ◽  
Author(s):  
A. N. Das ◽  
P. Choudhury ◽  
B. Ghosh
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Hubbard Model ◽  
Density Of States ◽  
Fermi Energy ◽  
Strong Correlation ◽  
Superconducting Transition Temperature ◽  
Hole Concentration ◽  
Oxide Superconductors ◽  
Superconducting Transition

Superconductivity in a nearly half-filled Hubbard model with large on-site repulsion has been studied following the Hubbard's approximation. At T = 0, the Fermi energy touches the top of the lower Hubbard subband for n = 1, one electron per site in the system. For a particular density of states, sharply peaked at the centre of the band, the superconducting transition temperature is zero for n = 1 (zero hole concentration) and becomes maximum at a hole concentration of 1/3. The high temperature thermoelectric power of the oxide superconductors has been discussed, which indicates the strong correlation in the system.

scholarly journals Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5830
Author(s):  
Andrzej Ślebarski ◽  
Maciej M. Maśka
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Phase ◽  
Length Scale ◽  
Superconducting Transition ◽  
Atomic Disorder ◽  
Strong Inhomogeneity ◽  
Related Compounds

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.

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