TWO-COMPONENT ALLOY MODEL FOR BISMUTHATE CERAMICS

1996 ◽  
Vol 10 (14) ◽  
pp. 627-633
Author(s):  
A.L. KUZEMSKY
Keyword(s):  
Transition Temperature ◽  
Strong Coupling ◽  
Concentration Dependence ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Superconducting Properties ◽  
Disordered Alloys ◽  
Electron Phonon Coupling ◽  
Two Component

The disordered binary substitutional A 1−x B x alloy model has been proposed for the description of the normal and superconducting properties of bismuthate ceramics Ba(Pb,Bi)O 3. The Eliashberg-type equations for the strong coupling superconductivity in strongly disordered alloys have been used to describe the superconducting properties. The relevant configurational averaging has been performed in the framework of CPA. The concentration dependence of electron-phonon coupling constant λ(x) and transition temperature Tc(x) has been calculated.

scholarly journals Forward Electron–Phonon Scattering in Normal and Superconducting States

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3083-3086 ◽  
Author(s):  
O. V. Dolgov ◽  
O. V. Danylenko ◽  
M. L. Kulić ◽  
V. Oudovenko
Keyword(s):  
Critical Temperature ◽  
Density Of States ◽  
Phonon Scattering ◽  
Phonon Frequency ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Superconducting Properties ◽  
Electron Phonon Coupling ◽  
D Wave ◽  
Electron Phonon Scattering

The sharp forward electron–phonon (FEP) and impurity (FIS) scattering change the normal and superconducting properties significantly. The pseudo-gap like features are present in the density of states for ω<Ω, where Ω is the phonon frequency. The superconducting critical temperature T c , due to the FEP pairing, is linear with respect to the electron–phonon coupling constant. The FIS impurities are pair weakening for s- and d-wave pairing.

H Implantation Improves Superconductivity in Non-Transition Metals

1983 ◽  
Vol 27 ◽  
Author(s):  
F. Ochmann ◽  
B. Stritzker
Keyword(s):  
Transition Temperature ◽  
Transition Metals ◽  
Superconducting Transition Temperature ◽  
Radiation Effects ◽  
Superconducting Transition ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Host Metal

ABSTRACTThe superconducting transition temperature, Tc, of a series of non-transition metals was improved by implantation of H and D into these metals kept below 10 K. In all cases the increase of Tc was considerably larger for H and D implantation with respect of He implantation causing only radiation effects. It could be shown that the enhancement of Tc depends on the electron-phonon coupling constant of the host metal, suggesting that mainly phonon effects dominate the improvement of Tc.

scholarly journals Estimation of electron-phonon coupling constant in Ba1-xKxBiO3

2020 ◽  
Vol 1686 ◽  
pp. 012049
Author(s):  
Alexander E Lukyanov ◽  
Vyacheslav D Neverov ◽  
Andrey V Krasavin ◽  
Alexey P Menushenkov
Keyword(s):  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Creating better superconductors by periodic nanopatterning

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Milan Allan ◽  
Mark H Fischer ◽  
Oliver Ostojic ◽  
Arjo Andringa
Keyword(s):  
Thin Films ◽  
Transition Temperature ◽  
Numerical Methods ◽  
Model Calculation ◽  
Lattice Mismatch ◽  
Specific Pattern ◽  
Design Parameters ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Correct Design

The quest to create superconductors with higher transition temperatures is as old as superconductivity itself. One strategy, popular after the realization that (conventional) superconductivity is mediated by phonons, is to chemically combine different elements within the crystalline unit cell to maximize the electron-phonon coupling. This led to the discovery of NbTi and Nb_33Sn, to name just the most technologically relevant examples. Here, we propose a radically different approach to transform a ‘pristine’ material into a better (meta-) superconductor by making use of modern fabrication techniques: designing and engineering the electronic properties of thin films via periodic patterning on the nanoscale. We present a model calculation to explore the key effects of different supercells that could be fabricated using nanofabrication or deliberate lattice mismatch, and demonstrate that specific pattern will enhance the coupling and the transition temperature. We also discuss how numerical methods could predict the correct design parameters to improve superconductivity in materials including Al, NbTi, and MgB_22.

scholarly journals Determination of the electron–phonon coupling constant in tungsten

2014 ◽  
Vol 105 (2) ◽  
pp. 023112 ◽  
Author(s):  
Szymon L. Daraszewicz ◽  
Yvelin Giret ◽  
Hiroshi Tanimura ◽  
Dorothy M. Duffy ◽  
Alexander L. Shluger ◽  
...  
Keyword(s):  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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