New Research on Superconductivity and Magnetism

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Nova Publishers, 2007 - Science - 215 pages
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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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Page x - Thus, a level of magnetic impurity of only 1 %, can result in a complete loss of SC. In a limited class of intermetallic systems, SC occurs even though magnetic ions with a local moment occupy all of one specific crystallographic site, which is well isolated and decoupled from the conduction path. The study of this class of magnetic-superconductors was initiated by the discovery of ternary RRh^ and RMoeSg (Cheverl-phases) compounds (R=rare-earth)[l], and has been recently revitalized by the discovery...
Page x - INTRODUCTION. Superconductivity (SC) and magnetism are two different ordered states into which substances can condense at low temperatures, and in general, these states are inimical to one another. Competition between SC and magnetism has been one of the main topics of study in the field of SC research. In...
Page 7 - Fig. 7 which shows that the change of x from 0.8 to 0.6, results in a small increase in Tc. Indeed, if all the carriers were introduced into the Cu-O planes, then for the under-doped (x=0.8) to the optimally doped (x=0.6) samples, p should vary by 0.2 and result in a large shift in Tc, as observed in La2-xSrxCuO4 and in other HTSC materials. It is thus possible, that in Ru-1222, the extra holes introduced by reducing Ce, are partially compensated for by depletion of oxygen...
Page v - Hole doping of the Cu-O planes, which results in metallic behavior and SC, can be optimized with appropriate variation of the R3+/ Ce4+ ratio (trivalent R3+ ions are replaced for Ce4+).
Page 6 - Hole (or carrier) density (p) in the CuO2 planes, or deviation of the formal Cu valence from Cu2+, is a primary parameter which affects TC in most of the HTSC compounds. In the well-established phase diagram La2-xSrxCuO4, the insulating parent La2CuO4 is AFM ordered.

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