ABSTRACT
For high-Tc superconductors, nuclear resonance has been of crucial importance in the present understanding of the underlying mechanisms for the normal properties of these materials. Since the 1950s nuclear magnetic resonance has been a valuable tool in the study of static and dynamic properties of materials and at present has found a wide range of applications in physics, chemistry, biology, and medicine. If the crystallites in the powders measured are not completely oriented, it is difficult to draw precise conclusions about the anisotropy of the Knight shift. Alignment of single crystals, on the other hand, is relatively easy. For the two extreme orientations the ratio of the contributions of the flux lattices to the second moment of the resonance line is given by Measurements on nonaligned powders will give a mixture of the various angular contributions.
