Download Magnetic Flux Structures in Superconductors: Extended by Prof. Dr. Rudolf Peter Huebener (auth.) PDF

By Prof. Dr. Rudolf Peter Huebener (auth.)

The discovery of high-temperature superconductors in 1986 by way of Bednorz and Müller led around the world to a swift development of the sector of superconductivity. This new curiosity extends to either the elemental features and the technological appli- cations of superconductors. The monograph "Magnetic Flux buildings in Superconductors" supplied an advent to this box, overlaying the advancements as much as its first booklet in 1979. quickly after 1986 the publication went out of print. in spite of the fact that, it remains to be wide-spread and quoted, and thanks to the ever starting to be curiosity in "Magnetic Flux constructions in Superconductors", a moment variation is now being made on hand. an in depth new bankruptcy provides a accomplished evaluate of advancements suitable to high-temperature superconductors. This new version offers researchers, engineers and different scientists with an intro- duction to this box; it is going to even be worthy as supplementary studying for graduate classes in low-temperature physics.

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In the following we turn to situations where the spatial variation of I~I becomes important. First we consider the nucleation of superconductivity in the interior of a bulk specimen as an external magnetic field is gradually reduced. At what field value does spontaneous nucleation of superconducting regions start to occur? During the first appearance of superconductivity the quantity I~I will be small. 53) the vector potential ~ is essentially given by the external magnetic field, since shielding supercurrents are proportional to 1~12 and can be neglected in the linearized approximation.

36]. The black laminae indicate the superconducting phase. 92. The straight Landau domains were always oriented precisely in the direction of the field component parallel to the large sample faces. Rotating this field component relative to the specimen resulted in a domain structure rotated by exactly the same amount. The direction of the sample edges did not seem to have any influence on the domain orientation. 40). Here, 8 is the angle between the applied field and the large faces of the superconducting plate.

1. 1) representing a rather general result characteristic of a second-order phase transition. 5) yielding a(fn-f) -aT- 2 2a . 6) We see that for T ~ Tc we have a(f n - f)/aT ~ 0, indicating a phase transition at least of second order. Next we relax our assumptions, allowing spatial variations of the order parameter, however, still keeping h = O. , the first significant terms being of second order, since in the absence of a magnetic field the equilibrium corresponds to ¥ = const. JP 1¥14 + Y[(~~f + (~i)2 + G~/] + ...

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