New Research on YBCO Superconductors
David M. Friedman
Nova Publishers, Mar 1, 2008 - Science - 288 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, 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. This Publication presents new research on yttrium barium copper oxide superconductors, often abbreviated YBCO, which is a chemical compound with the formula YBa2Cu3O7. This material, a famous 'high-temperature superconductor', achieved prominence because it was the first material to superconduct above the boiling point of nitrogen. All materials developed before YBCO became superconducting only at temperatures near the boiling points of liquid helium or liquid hydrogen (Tb = 20.1 K). The significance of the discovery of YBCO is the breakthrough in the refrigerant used to cool the material to below the critical temperature.
What people are saying - Write a review
We haven't found any reviews in the usual places.
actuator air gap applied field attractive force BaCeO3 bimetal bulk ring sample bulk samples bulk superconductors calculated ceramic CFRPs coil cooling current density decrease deformation denotes detect diameter doped EBSD eigenvalue electrical resistance electromagnetic film flux lines flux pinning free energy frequency Gd-Ba-Cu-O bulk geometry Gibbs free energy HTS bulk HTS samples increases inhomogeneity isothermal dwell Jc values Lett liquid loop M. R. Koblischka magnetic field magnetic flux magnetometer magnetostrictive material measured microstructure Murakami nanoclusters nanoparticles nanostripes Nariki NQR spectra nuclear spin-lattice relaxation order parameter orientation oxygen oxygen content pair amplitudes phase Phys Physica pseudo spin-gap S-layer Sakai SCPM undulator sensor shown in Figure shows spin spin-lattice relaxation SQUID starting powder Supercond Sci superlattice surface thickness trapped field upper critical field variation vortex cores vortex lattice vortex theory wipeout Y-211 particles YBCO YBCO matrix
Page 5 - Rozenblit are supported by a joint grant from the Center for Absorption in Science of the Ministry of Immigrant Absorption and the Committee for Planning and Budgeting of the Council for Higher Education under the framework of the KAMEA program.