New Research on Superconductivity
Barry P. Martins
Nova Publishers, 2007 - Technology & Engineering - 223 pages
Superconductivity is the ability of certain materials to conduct electrical current with no resistance and extremely low losses. High temperature superconductors, such as La2-xSrxCuOx (Tc=40K) and YBa2Cu3O7-x (Tc=90K), were discovered in 1987 and have been actively studied since. In spite of an intense, world-wide, research effort during this time, a complete understanding of the copper oxide (cuprate) materials is still lacking. Many fundamental questions are unanswered, particularly the mechanism by which high-Tc superconductivity occurs. More broadly, the cuprates are in a class of solids with strong electron-electron interactions. An understanding of such "strongly correlated" solids is perhaps the major unsolved problem of condensed matter physics with over ten thousand researchers working on this topic. High-Tc superconductors also have significant potential for applications in technologies ranging from electric power generation and transmission to digital electronics. This ability to carry large amounts of current can be applied to electric power devices such as motors and generators, and to electricity transmission in power lines. For example, superconductors can carry as much as 100 times the amount of electricity of ordinary copper or aluminium wires of the same size. Many universities, research institutes and companies are working to develop high-Tc superconductivity applications and considerable progress has been made. This volume brings together new leading-edge research in the field.
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Phase Diagram for NatH302Co02 JH2O
Contribution of the ElectronPhonon Interaction to HighTc Superconductivity Tunneling Study of Bi2Sr2CaCu208
Relativistic BEC and the Generalized BEC Model of Superconductivity
Superconducting Fluctuations above Tc IN OVERDOPED BI2SR2CaCU208+s
antibosons ARPES axis BCS theory behavior BLH compound boson C0O2 layer calculated carbon nanotubes chemical chirality conductance Cooper pairs coupling constant critical temperature crystal cuprates curve damping rate decreases density dependence of T\T dispersion relation doping e-ph interaction electron-phonon electrons energy equation estimated experimental Fermi surface Figure film finite fitting high-temperature superconductivity increases individual MWNTs Josephson coupling lattice Lett Li2Pd3B magnetic field magnetic fluctuations magnetically ordered measured mechanism Meissner effect metallic MWNT Nernst effect Nernst signal normal observed obtained on-tube resistance oxonium ions oxygen pairing parameters peak phase diagram phonon phonon structures Phys physical plasmon pseudogap Raman renormalized resistive transition room temperature Sakurai Sasaki shown in Fig spectral function superconducting gap superconducting transition temperature SWNT SWNT bundle SWNT mat symmetry Takada Takayama-Muromachi temperature dependence tubes tunneling underdoped valence wires zero
Page 19 - G. Dresselhaus and MS Dresselhaus, Physical Properties of Carbon Nanotubes (London: Imperial College Press), 1999.
Page 19 - The growth rates corresponding to the modes of maximum instability are found for different values of the current strength and the minimum e-folding time of an instability is found to be in reasonable agreement with the experimental values of Dattner et al. In the absence of surface tension, however, such modes of maximum instability do not occur and for finite conductivity the current is destabilizing at all wavelengths as shown by Tayler (1960). In the general case when the resistivity is finite,...
Page 37 - At the lowest temperature, the enhancement factor is about 4.3. Without superconductivity in these MWNTs, it is very difficult to account for such a large enhancement in the diamagnetic susceptibility upon bundling of the tubes. 4 Raman Spectroscopic Evidence for Superconductivity at 665 K It is known that Raman scattering has provided essential information about the electronphonon coupling and the electronic pair excitation energy in the high-Tc cuprate superconductors [44, 45, 46].