High-critical-temperature Superconductors

The high critical temperature superconductors show a strong anisotropy in different properties critical current density [1], resistivity [2, 3] and the upper critical field [2],... 

Some other applications of technetium are the following [283] use of some of its alloys as superconductors with high critical temperature, use of 99Tc in high-temperature thermocouples, construction of basic anticorrosive covers for nuclear reactors, etc. 

V. A. Maroni and J. R. Ferraro, The use of vibrational spectroscopy in the characterization of high-critical temperature ceramic superconductors, in Practical Fourier Transform Infrared Spectroscopy—Industrial Laboratory Chemical Analysis (J. R. Ferraro and K. Krishnan, eds.). Academic Press, San Diego (1990), and references therein. 

These colloidal approaches are being used today to synthesize advanced materials, such as high-critical-temperature ceramic superconductors (20). 

The following tables include superconductive properties of selected elements, compounds, and alloys. Individual tables are given for thin fUms, elements at high pressures, superconductors with high critical magnetic fields, and high critical temperature superconductors. 

Electronic Structure and High Critical Temperature in Oxide Superconductors... 

A class of metal cluster superconductors of particular Interest consists of ternary molybdenum chalcogenides, conmonly known as the Chevrel phases (13). These phases were the first type of superconducting ternary system found to have relatively high critical temperatures and exhibited the highest known critical magnetic fields (Hc2 before discovery of the copper oxide... 

The second example is also from solid state physics. For many decades top physicists did advanced work on superconductivity, but in spite of their sophisticated theories they were unable to make materials having a critical temperature for superconductivity in excess of 23 K. The recent successes in constructing high-critical temperature superconductors were not the result of theoretical prediction but of laboratory work, done by solid state chemists with the wrong guidelines. 

The first superconductor oxide at a high critical temperature ( 40 K), was discovered in 1986, and was that one based on the La CuO structure, but with a doped La Sr CuO form, received the Nobel Prize for Physics on 1997 awarded to Geoig J. Bednorz and Alexander K. Muller for their important break-through in the discovery of superconductivity in ceramic materials . ... 

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