Handbook of Applied Superconductivity by B Seeber

By B Seeber

The instruction manual of utilized Superconductivity, Two-Volume Set covers all vital points of utilized superconductivity and the helping low-temperature applied sciences. The guide basically demonstrates the features of superconducting applied sciences and illustrates the right way to enforce those applied sciences in new parts of educational and business study and improvement. quantity One offers an creation to the theoretical historical past of either high and low Tc superconductivity, by means of information of the fundamental similar to wires, tapes, and cables utilized in functions of superconductivity and the required helping technology and expertise. Theoretical discussions are normally by means of examples of genuine designs, fabrication recommendations, and sensible instrumentation advice. a last bankruptcy examines fabrics homes at low temperatures. quantity presents examples of present and destiny purposes of superconductivity. It covers scientific platforms for magnetic resonance imaging (MRI), excessive box magnets for learn, superconducting magnets for accelerators, commercial structures for magnetic separation, and transportation platforms. the ultimate chapters glance to destiny purposes in strength and superconducting electronics. With absolutely referenced, peer-refereed contributions from specialists in numerous fields, this two-volume paintings is a necessary reference for quite a lot of scientists and engineers in educational and business examine and improvement environments.

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5 Advantages and limitations of the London theory A great advantage of the London theory is that it qualitatively correctly describes the linear electrodynamical response of a superconductor, properly taking into account the basic properties of zero resistance and perfect diamagnetism. This allows one to design superconducting circuits and estimate their parameters in a very simple way, using the London equations, which is extremely important for engineering applications. On the other hand, the London theory is limited in several ways.

76) is referred to as GL depairing critical current density Jc . In conclusion, the GL theory is general enough to solve most practical problems in superconductors including nonlinear response to a static magnetic field. Its later extension to a high-frequency response is called the time-dependent GL theory. The GL theory deals successfully with complicated problems of vortex nucleation in type II superconductors (see chapter A2). One disadvantage is that the GL theory is valid quantitatively only in the vicinity of Tc when the order parameter ψ is small enough.

At present there is still no consensus about the nature of the pairing mechanism. 2. 3 we have considered the GL theory introduced on a purely phenomenological basis. To use it for applications one needs to be certain about its microscopic justification and limits of applicability. The microscopic derivation was done by Gor’kov (1959) who has shown that it is possible to establish the GL equations from the microscopic BCS theory and to calculate the coefficients in the GL expansion of the free energy.

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