Microscopic Theory of Superconductivity

2019 ◽  
pp. 592-631
Keyword(s):  
Microscopic Theory ◽  
Theory Of Superconductivity

scholarly journals Contribution of Ukrainian Scientists to the Development of Electrodynamics

2020 ◽  
Vol 65 (1) ◽  
pp. 82
Author(s):  
I. V. Korsun
Keyword(s):  
Arc Welding ◽  
Social Activity ◽  
Microscopic Theory ◽  
Acoustic Resonance ◽  
Popularization Of Science ◽  
Scientific Schools ◽  
Photoelectromotive Force ◽  
Radio Signals ◽  
Live Broadcast ◽  
Theory Of Superconductivity

The aim of the paper is to prove the importance of the works performed by Ukrainian scientists for the development of electrodynamics. Some examples of achievements made by Ukrainian scientists in this scientific area include physical theories in such directions as the electrical conductivity, domain structure of ferromagnets, photoelectromotive force in semiconductors, microscopic theory of superconductivity, Shubnikov–de Haas effect, magneto-acoustic resonance, invention of an electric tram, live broadcast of the moving-image signal, distant control of objects by means of radio signals, and arc welding of metals. Most Ukrainian scientists have founded their own scientific schools, which works are recognized throughout the world. They were not only engaged in the scientific and lecturing activities, but also in the popularization of science, reformation of the education system, and social activity.

Electron-momentum distribution of cuprate superconductors in a full charge-spin recombination scheme

2015 ◽  
Vol 29 (29) ◽  
pp. 1550178 ◽  
Author(s):  
Shiping Feng ◽  
Lülin Kuang ◽  
Huaisong Zhao
Keyword(s):  
Momentum Distribution ◽  
Cuprate Superconductors ◽  
Unsolved Problem ◽  
Microscopic Theory ◽  
Sum Rule ◽  
Electron Momentum ◽  
Electron Momentum Distribution ◽  
A Charge ◽  
Full Charge ◽  
Theory Of Superconductivity

A long-standing unsolved problem is how a microscopic theory of superconductivity in cuprate superconductors based on the charge-spin separation can produce a large electron Fermi surface (EFS). Within the framework of the kinetic-energy driven superconducting mechanism, a full charge-spin recombination scheme is developed to fully recombine a charge carrier and a localized spin into an electron, and then is employed to study the electron-momentum distribution in cuprate superconductors. In particular, the theory shows that the underlying EFS fulfills Luttinger’s theorem, and the sum rule for the constrained electron is obeyed.

FIVE POSSIBLE REASONS WHY HIGH-Tc SUPERCONDUCTIVITY IS STALLED

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2313-2323
Author(s):  
M. GRETHER ◽  
M. DE LLANO
Keyword(s):  
Microscopic Theory ◽  
Bcs Theory ◽  
Einstein Condensation ◽  
Critical Temperatures ◽  
Electron Pairs ◽  
High Tc ◽  
Bose Einstein Condensation ◽  
Phonon Mechanism ◽  
Bose Einstein ◽  
Theory Of Superconductivity

Five commonly held premises considered questionable assumptions in the microscopic theory of superconductivity are discussed as possible reasons why the search appears to be stalled for a theoretical framework, admittedly ambitious, capable of predicting materials with critical temperatures Tc higher than the 1993 record of 164K in HgTlBaCaCuO (under pressure). We focus the dilemma as a whole in terms of a generalized Bose-Einstein condensation (GBEC) interpretation that includes and further extends BCS theory, as well as substantially enhancing its predicted Tcs within the electron-phonon mechanism producing pairing. The new GBEC model is an extension of the Friedberg-T.D. Lee 1989 boson-fermion BEC theory of high-Tc superconductors in that it includes hole pairs as well as electron pairs.

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