نتایج جستجو برای: superconductivity

تعداد نتایج: 11967  

2008
Ralph C. Dougherty

Received DOI: 2 Superconductivity arises when solids have conducting bands (singly occupied wave functions) that do not have electron-nuclear scattering (Fermi contact) and the temperature is low enough to eliminate partial wave scattering of electrons. This means that the conducting bands do not include s basis functions (atomic quantum numbers l ,m = 0), and the temperature is low enough so t...

2016
W. Heinz

A review of large scale applications of high current and high field superconductivity is given. Requirements to and properties of technically used superconductors are discussed. Superconducting magnets as research tools are widely used in elementary particle and solid state research. Applications of superconductivity for industrial purposes seem to be promising for electrical machinery, magneti...

2007
Hans G. Kaper Bixiang Wang Shouhong Wang

It is shown that a solution of the time-independent Ginzburg-Landau equations of superconductivity is determined completely and exactly by its values at a nite but suuciently dense set of determining nodes in the domain. If the applied magnetic eld is time dependent and asymptotically stationary, the large-time asymptotic behavior of a solution of the time-dependent Ginzburg-Landau equations of...

2016

Superconductivity is a rare physical state in which matter is able to conduct electricity—maintain a flow of electrons—without any resistance. It can only be found in certain materials, and even then it can only be achieved under controlled conditions of low temperatures and high pressures. New research from a team including Carnegie's Elissaios Stavrou, Xiao-Jia Chen, and Alexander Goncharov h...

Journal: :Physical review. B, Condensed matter 1989
Sheng Li Gong

The strongly correlated two-dimensional Cu0& layer is studied to identify the mechanism of possible pairing superconductivity. The correlative motions of 0 and Cu holes are treated by a reasonable mean-field theory, and we find that holes on oxygen sites couple strongly to Cu holes to form Cu-0 spin singlet pairs, which in turn interact strongly with the Cu resonating-valence-bond state and lea...

2000
J. E. Schirber G. H. Kwei

We have studied the reversible pressure induced structural transition (primitive cubic to polymeric monoclinic) of Na2CsCGoand the superconductivity in both phases. We have established that the polymeric phase of Na2CsC60 is superconducting with an ambient pressure transition temperature about 3 K lower than that for the primitive cubic phase. We believe that an analogous lowering of the transi...

2006
Shiping Feng Huaiming Guo

Within the kinetic energy driven superconducting mechanism, we study the interplay between superconductivity and the nodal and antinodal superconducting quasiparticle coherences in cuprate superconductors, and find the s-wave superconducting transition temperature is heavily suppressed by the antinodal superconducting quasiparticle coherence, while the d-wave superconducting transition temperat...

2016

Superconductivity is a rare physical state in which matter is able to conduct electricity—maintain a flow of electrons—without any resistance. It can only be found in certain materials, and even then it can only be achieved under controlled conditions of low temperatures and high pressures. New research from a team including Carnegie's Elissaios Stavrou, Xiao-Jia Chen, and Alexander Goncharov h...

2001
YUVAL OREG

We discuss the destruction of superconductivity in quasi-one-dimensional systems due to the interplay between disorder and Coulomb repulsion. We argue that to understand the behavior of the system one has to study both fermionic and bosonic mechanisms of suppression of superconductivity. The former describes reduction in the mean field critical temperature Tc, while the latter refers to thermal...

خدابخش, رسول , صدقی, حسن , نجف پور, حامد ,

 Bi-based and Ag-doped superconductors were irradiated by neutrons. Experimental result showed that XRD patern-intensity of irradiated Bi-based sample was decreased and The Tc of these samples were decreased by 7-10 K. The neutron irradiated sample was also found to decrease by 50% the normal state resistivity of samples. Therefore, neutron irradiation is a useful method to improve the supercon...

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