英文: 3 Although there is reason to hope that superconductivity may one day be found to exist in some materials at room temperature, for the moment is a phenomenon of the utterly cold.
英文: Although it occurs only at very low temperatures, superconductivity has a wide variety of present-day uses, as well as potential future applications.
英文: On the other hand, in the four years since the discovery of superconductivity in this compound, the research community has made considerable improvements in critical current density, both in the low-field value and, perhaps more important, in the higher-f
英文: Physicists know that in both types of material, the superconductivity is caused by electrons pairing up and gathering en masse in a single collective quantum state.
英文: The fact that the shift in Tc was a little larger than the simple prediction can be accommodated by BCS theory—it indicates that the boron vibrations are more important to the superconductivity than the magnesium vibrations [see box on page 87].