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

Considering the large development accomplished in a few exact components of superconductivity over the last few years, it appeared priceless to debate completely an issue, which has encountered serious professional­ blems at the theoretical and the experimental facet, specifically the results of the anisotropic electron and phonon houses of (single crystalline) fabrics at the attribute positive factors of the great­ engaging in nation. the truth that the vast majority of scientists actively engaged during this examine box at the present have been introduced jointly on the assembly, has ended in a virtually entire insurance of the pertinent issues during this quantity. Six assessment papers speak about the advance and the current nation of concept and test about the anisotropies of the higher serious box and the magnetization in addition to the flux line lattice and the superconducting strength hole. moreover, 18 papers current the latest study on those homes and extra anisotropy results linked to the intermediate country styles or the categorical warmth. in regards to the magnetic houses, striking contract among idea and test has been completed; nevertheless, arguable perspectives in regards to the lifestyles of anisotropy within the superconducting strength hole are provided. In either situations, how­ ever, theorists and experimentalists are nonetheless faced with a few open questions. it's the function of this publication to attract the eye of scientists to those interesting difficulties. Harald W.

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Phys . Teichler, paper R-1, this volume, p. Mag. Rev.

The anisotropy measurements in the works quoted above were restricted to one or two fixed tem- Review of Hc2 Anisotropy 33 peratures. Using a sample with RRR = 100, Farrell et a1. 2 K to the transition temperature. 5 a four term (n = 4) cubic harmonic fit reproduces the data to experimental accuracy. 5 they state that small systematic deviations from the n =4 fit arise, but reliable values of A5 could not be obtained. 006). 05 made by Williamson. The deviation appears to be largest near the <001> direction.

This implies that no anisotropy is expected in materials with cubic symmetry in the local GL limit. This fact was first pointed out by Hohenberg and Werthamer /6/ (hereafter HH), who al so showed that Fermi surface anisotropy can give rise to Hc2 anisotropy by considering nonlocal corrections to the local GL equation derived by Gor'kov /7/. The theory thus predicts a diminution of anisotropy as the local limit is approached with an increase in temperature and impurity scattering. The main features of the HW theory were found to be in accord \'Jith early experiments by Reed et al /8/.

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