Anisotropy Effects in Superconductors by H. Teichler (auth.), Harald W. Weber (eds.)

By H. Teichler (auth.), Harald W. Weber (eds.)

Considering the large development completed in a few specified parts of superconductivity over the last few years, it appeared useful to debate completely a subject matter, which has encountered serious seasoned­ blems at the theoretical and the experimental part, specifically the consequences of the anisotropic electron and phonon houses of (single crystalline) fabrics at the attribute beneficial properties of the tremendous­ carrying out kingdom. the truth that nearly all of scientists actively engaged during this examine box at this time have been introduced jointly on the assembly, has ended in a virtually whole assurance of the pertinent themes during this quantity. Six assessment papers talk about the advance and the current nation of thought and test about the anisotropies of the higher severe box and the magnetization in addition to the flux line lattice and the superconducting strength hole. in addition, 18 papers current the newest examine on those homes and extra anisotropy results linked to the intermediate nation styles or the explicit warmth. about the magnetic houses, impressive contract among conception and test has been completed; however, arguable perspectives concerning the lifestyles of anisotropy within the superconducting strength hole are offered. In either circumstances, how­ ever, theorists and experimentalists are nonetheless faced with a few open questions. it's the goal of this booklet to attract the eye of scientists to those interesting difficulties. Harald W.

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L) (a 4 =A4/Ao and a6 =A6/Ao) versus the impurity parameter a. with the temperature T as parameter. (Although we are aware of the sl ight inconvenience resu1 ting from the choice of the actual measuring temperature T as parameter instead of the reduced temperature TIT c ' the impurity effect is demonstrated more clearly by the presentation used. Furthermore, a plot of the coefficients a4 and a6 versus reduced temperature t and with a. 3, that the coefficient a4 decreases sharply with the addition of only a small amount of impurities and more slowly furtheron.

8%. <14. Preliminary results have been published /22/ and showed that the second harmonic coefficient A2 became virtually independent of impurity content above about 2 at% In or for a> 3. In contrast to the statement made there, the fact that A2 remains constant in the quasilocal regime is precisely what HW predict as it was found that the average critical field, Hc2 =AI' varied linearly with impurity parameter. , which is the conclusion of the quasilocal theory. 2 are sho\'Jn in Fig. 2, where the sol id curve represents numerical ca 1cu1ations made by Nagashima /22/ for G2.

The role of impurity in this nonlocal regime is not clear both experimentally and theoretically. There is also much to be clarified in the anisotropy of the lower critical field Hc1 . Although some work has appeared on the anisotropy of magnetization /13,14,18/, it has not been included in the review, because it is felt that more systematic work is necessary before a thorough analysis can be made. Future work on all these quantities should hopefully provide a coherent picture as to how microscopic anisotropy is reflected in macroscopic anisotropy related to the critical field.

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