By H. Teichler (auth.), Harald W. Weber (eds.)
Considering the big development completed in a few targeted parts of superconductivity over the past few years, it appeared necessary to debate completely an issue, which has encountered critical seasoned blems at the theoretical and the experimental facet, particularly the consequences of the anisotropic electron and phonon homes of (single crystalline) fabrics at the attribute beneficial properties of the large undertaking country. the truth that nearly all of scientists actively engaged during this examine box at the present have been introduced jointly on the assembly, has resulted in a nearly whole assurance of the pertinent issues during this quantity. Six evaluation papers talk about the improvement 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 latest examine on those homes and extra anisotropy results linked to the intermediate kingdom styles or the categorical warmth. in regards to the magnetic houses, awesome contract among idea and scan has been accomplished; nonetheless, debatable perspectives in regards to the lifestyles of anisotropy within the superconducting power hole are provided. In either instances, 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 attention-grabbing difficulties. Harald W.
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Extra resources for Anisotropy Effects in Superconductors
Hc2 anisotropy in cubic materials is of interest, as it is one of the few if not the only phenomenon which depends solely on nonlocal properties of the order parameter, a property of vital importance for our understanding of superconductivity. It can be stated, that the essential correctness of Hc2 anisotropy theories based on nonlocality has been established through the analysis of the temperature and impurity scattering dependence of the anisotropy parameters. Present experiments, however, cannot distinguish between the microscopic origins of anisotropy, and the material parameters are subject to future analysis.
However, experiments to date appear to support qualitatively the predictions for the temperature dependence of A2 and A3 . \i3 for n = 2 and n = 3, respectively. The predicted temperature insensitivity of the ratio A4/A3 also appears to be supported down to low temperatures /15,16/. The fact that the quasilocal limit behavior appears to extend down to low temperature regions has, to a large extent, been clarified by Teichler /11/ who, based on the small anisotropy approach, calculated the temperature dependence of A2 and A3 for the clean limit valid in the nonlocal regime.
This is, of course, no longer true for sample Nb6 (not shown in the figure), where the precipitate formation reduces the amount of nitrogen dissolved on interstitial positions leading to a reduction of the mean free path, which falls considerably below the value corresponding to the real nitrogen content. Inductive measurements of the transition temperature showed a gradual decrease of Tc with increasing impurity content. 77). The system niobium - nitrogen seems, therefore, to be more suitable for the present purpose than the Nb-Ta alloy system studied previously 131 (cf.
Anisotropy Effects in Superconductors by H. Teichler (auth.), Harald W. Weber (eds.)