The Formation of Cooper Pairs and their Role in Nondissipative Diamagnetic Currents in the Micro- and Macro-Scopic Sized Graphene Materials; Towards High-Temperature Superconductivity

2014 ◽  
Vol 918 ◽  
pp. 36-41
Author(s):  
Takashi Kato
Keyword(s):  
High Temperature ◽  
Experimental Research ◽  
High Temperature Superconductivity ◽  
Hydrogen Plasma ◽  
Graphite Powder ◽  
Cooper Pairs ◽  
Coulomb Interactions ◽  
Solid State Physics ◽  
Previous Theory ◽  
Homo Lumo

The mechanism of the formation of Cooper pairs and their role in the occurrence of nondissipative diamagnetic currents is investigated. In the previous works [1-, we suggested that in the materials with large HOMO-LUMO gaps (ΔEHOMO-LUMO,N), the Cooper pairs are formed by the large HOMO-LUMO gaps as a consequence of the quantization of the orbitals by nature, and by the attractive Coulomb interactions between two electrons with opposite momentum and spins occupying the same orbitals via the positively charged nuclei. On the other hand, according to the recent experimental research [, the Cooper pairs have been observed at room temperatures in the neutral benzene (6an), naphthalene (10ac), anthracene (14ac), and coronene molecules. That is, our prediction in our theoretical researches [1-can be well confirmed by the recent experimental research [, and our previous theory can be reasonably applied to the explanation of the mechanism of the occurrence of the granular high temperature superconductivity in carbon materials [. We show that the forming of Cooper pairs [ can be well explained by our theory previously suggested [1-. We also suggest the reasonable mechanism of the occurrence of granular high temperature superconductivity in the graphite powder treated by water or exposed to the hydrogen plasma, discovered by Esquinazi et al. [, on the basis of our previous theoretical works described above [1-, which can be well confirmed by the recent experimental work [. We also suggest the general guiding principle towards high temperature superconductivity. We suggest that any material with large ΔEHOMO-LUMO,N value (more than a few eV), in which valence bands are completely occupied by electrons, which has been believed to be typical insulator in view of solid state physics and chemistry, has a possibility to exhibit high temperature superconductivity in solids.

scholarly journals Superconductivity and Cooper Pairs

2017 ◽  
pp. 104-107
Author(s):  
Mitramani Subedi Subedi
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Energy Crisis ◽  
Cooper Pairs ◽  
Intensive Research ◽  
Crucial Information

In this article, some crucial information is given in regard to superconductivity. The advancement in high temperature superconductivity is believed to solve the problem of energy crisis. So, intensive research in this part of physics is recommended. Actually, Cooper pairs of electrons are responsible for superconductivity.The Himalayan Physics Vol. 6 & 7, April 2017 (104-107)

THE COULOMB FORCE AND THE VARIOUS THERMODYNAMIC PHASES OF SIMPLE METALS

1990 ◽  
Vol 04 (01) ◽  
pp. 1-43 ◽  
Author(s):  
DANIEL C. MATTIS
Keyword(s):  
High Temperature Superconductivity ◽  
Density Wave ◽  
Coulomb Repulsion ◽  
Coulomb Force ◽  
Companion Paper ◽  
Coulomb Interactions ◽  
Solid State Physics ◽  
Hubbard Interaction ◽  
Charge Density Wave Phase ◽  
A Charge

With just two-body Coulomb interactions between electrons being taken into account, the phase diagram of a simple metal includes the following phases at least: the ordinary paramagnetic Fermi liquid, itinerant ferromagnetism, a charge-density wave phase and an antiferromagnetic phase (either of which can be insulating), and — surprisingly — a superconducting phase. The present work surveys the physics of the Coulomb interactions in metals, and the diverse roles played by the zero-range Hubbard interaction U0 and the long-range Coulomb interactions denoted ΔV (q). Screening of the latter by the currents in the metal is treated in some detail. This work is intended as an introduction into an important area of solid-state physics. A number of novel ideas are proposed, but are clearly identified as such. For example: although V (q) ≡ U0 + ∆V (q) is required to be positive at all q, υ(q) ≡ (1/2) U0 + ∆V (q) is not. We show that if υ (q) < 0 in a given phase, that phase is unstable (regardless of band structure, etc.). We also find that the Coulomb repulsion between electrons in a given band is somewhat stronger than that between holes. A companion paper based on the concepts presented here elaborates the theory of high-temperature superconductivity in layered metals.

scholarly journals Statistical Complexity of the Coriolis Antipairing Effect

Entropy ◽  
2019 ◽  
Vol 21 (6) ◽  
pp. 558 ◽  
Author(s):  
Flavia Pennini ◽  
Angelo Plastino
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Total Spin ◽  
Cooper Pairs ◽  
Statistical Complexity ◽  
Thermal Disorder ◽  
Pairing Interactions

Using the entropic quantifier called statistical complexity, we investigate the interplay between (1) pairing interactions between fermions, can be viewed as analogous with superconductivity based on Cooper pairs; (2) rotations of the system as a whole around an axis; and (3) thermal excitations. Two different ordering processes are at work: alignment and pairing of two fermions to total spin zero. They compete among themselves and with thermal disorder. A complex physics ensues as a consequence. The existence of novel phenomena is revealed by the behavior of the statistical complexity. In particular, it is seen how order can arise out of disorder in originating high-temperature superconductivity.

scholarly journals The Needle in the Haystack for Theory of High Temperature Superconductivity: Negative Nuclear Magnetic Moments

2018 ◽  
Author(s):  
Reginald Little
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Cooper Pair ◽  
High Temperature Superconductivity ◽  
Magnetic Moments ◽  
High Energy ◽  
Cooper Pairs ◽  
Nuclear Magnetic Moments ◽  
Relativistic Scattering ◽  
Nuclear Magnetic

This work outlines a theory for explaining high temperature superconductivity on the basis of relativistic scattering of Cooper pairs via beyond room temperature conditions causing high energy relativistic scattering of Cooper pairs with nuclei having positive and negative nuclear magnetic moments for fractionally reversibly fissing and fusing the nuclei for manifesting in the electronic lattice for altered quantum fields for more tightly binding the Cooper pair beyond the conventional critical temperature 40K limit for superconductivity beyond room temperature.

scholarly journals The Needle in the Haystack for Theory of High Temperature Superconductivity: Negative Nuclear Magnetic Moments

2018 ◽  
Author(s):  
Reginald Little
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Cooper Pair ◽  
High Temperature Superconductivity ◽  
Magnetic Moments ◽  
High Energy ◽  
Cooper Pairs ◽  
Nuclear Magnetic Moments ◽  
Relativistic Scattering ◽  
Nuclear Magnetic

This work outlines a theory for explaining high temperature superconductivity on the basis of relativistic scattering of Cooper pairs via beyond room temperature conditions causing high energy relativistic scattering of Cooper pairs with nuclei having positive and negative nuclear magnetic moments for fractionally reversibly fissing and fusing the nuclei for manifesting in the electronic lattice for altered quantum fields for more tightly binding the Cooper pair beyond the conventional critical temperature 40K limit for superconductivity beyond room temperature.

SOFT-PLASMON MECHANISM FOR HIGH-TEMPERATURE SUPERCONDUCTIVITY

1987 ◽  
Vol 01 (03n04) ◽  
pp. 965-971 ◽  
Author(s):  
J. ASHKENAZI ◽  
C.G. KUPER ◽  
R. TYK
Keyword(s):  
High Temperature ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Cooper Pairs ◽  
Strong Electron ◽  
Metal Insulator ◽  
Order Of Magnitude

Recently-discovered high-temperature superconductors border on a Mott metal insulator transition; pure La2CuO4 undergoes a commensurate charge-density-wave transition and becomes an insulator. At other compositions, the incipient charge-density wave causes a drastic softening of those plasmon modes with wave vectors connecting points on the Fermi surface. These soft plasmons (typically tenths of an electron-volt) serve as the attraction which binds Cooper pairs, instead of the usual phonons. Consequently, transition temperatures are an order of magnitude larger than for phonon-induced superconductivity. One of the factors responsible for the strong electron - plasmon coupling is the influence of the empty f-orbitals of La or Ba.

ELECTRONIC RAMAN SCATTERING IN CUPRATE SUPERCONDUCTORS

2013 ◽  
Vol 27 (09) ◽  
pp. 1330006
Author(s):  
ZHIHAO GENG ◽  
SHIPING FENG
Keyword(s):  
High Temperature ◽  
Raman Scattering ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Cooper Pairs ◽  
Electronic Excitations ◽  
Temperature Dependent ◽  
Electronic Raman Scattering ◽  
Raman Response ◽  
Theoretical Results

Since the discovery of cuprate superconductors, the mechanism of high temperature superconductivity is still a mystery. Among the investigation tools, the electronic Raman scattering is a powerful one to probe electronic excitations in different regions of the Fermi surface of cuprate superconductors by a simple choice of the incident and scattered polarization vectors. Thus the symmetry of the superconducting Cooper pairs can be indicated. In this article we review our investigations of electronic Raman scattering in cuprate superconductors based on the t–J model within the kinetic energy driven superconductivity. The theory of electronic Raman response in cuprate superconductors is presented together with an overview of the charge-spin separation fermion-spin theory to handle the t–J model. Some theoretical results of electronic Raman response are presented in comparison with the experimental results. Special emphasize is given to the doping and temperature dependent of electronic Raman spectra.

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