U.S.-Austria Cooperative Research on Anisotropy In Grain Aligned Superconducting (123)-Compounds

该奖项支持合作互动之间 爱荷华州州立大学物理系的科学家， 由道格拉斯K.芬尼莫尔和哈拉尔德教授 W.韦伯和他的同事们， 奥地利大学，在维也纳。 这两个团体一直在 研究磁特性的各向异性， 高温超导体的载流能力。 他们的目标是开发大块超导材料， 将承载高临界电流，因此适合于 大磁铁中的导体材料。 他们的合作工作 计划在很大程度上依赖于他们互补的专业知识， 设施 爱荷华州州立大学组非常 在各向异性超导体理论方面， 晶粒定向材料的样品制备，在测量中- 涡旋线能量的分量和钉扎的研究 涡流运动的可能性。 奥地利集团拥有强大的 超导体辐射损伤的经验， 对基本磁化强度的高精度研究 这些高度各向异性材料的性质 爱荷华州州立大学的美国小组将准备 晶粒取向晶体样品，测量其基本性能 并安排在美国的几个加速器上进行辐照 设施 奥地利小组将测量磁场， 这些材料的结构特性使用不同的 磁化仪器（包括其17特斯拉磁化， （设备） 还将对 利用透射电子的离子径迹造成的损伤 谱 对各向异性效应理解的发展 对于高温超导体中的磁通钉扎， 具有根本性和实际意义。 古典 超导体是高度各向同性的， 温度材料，所以这里提出的实验是在 一个新的制度，其中维度和拓扑发挥更多的作用， 重要的作用此外，还有一个很大的回报， 开发新材料和新的加工方法， 生产具有更高临界电流密度的导体 价值观 目前没有令人满意的导体 磁性材料，因为机械性能和 输运临界电流非常差。 因此，任何 提高临界载流能力的 高温大块超导体将具有较大的 对新磁体和新屏蔽可用性的影响 材料.

This award supports collaborative interactions between scientists in the Department of Physics, Iowa State University, led by Professor Douglas K. Finnemore, and Professor Harald W. Weber and colleagues of the Atomic Institute of the Austrian Universities, in Vienna. The two groups have been studying the anisotropy of the magnetic properties and current carrying capacity of high temperature superconductors. Their goal is to develop bulk superconducting materials which will carry a high critical current and thus be suitable for conductor material in large magnets. Their cooperative work plan relies heavily on their complementary expertise and facilities. The Iowa State University group is very experienced in the theory of anisotropic superconductors, in sample preparation for grain oriented materials, in measure- ments of the vortex line energy and in the study of pinning potentials for vortex motion. The Austrian group has great experience with radiation damage in superconductors and highly accurate studies of the fundamental magnetization properties of these highly anisotropic materials The U.S. group at Iowa State University will prepare the grain oriented crystal samples, measure their basic properties and arrange for their irradiation at several U.S. accelerator facilities. The Austrian group will measure the magnetic and structural properties of these materials using different magnetization instruments (including their 17 tesla magnetiza- tion apparatus.) There will also be a thorough study of the damage done by the ion tracks using transmission electron spectroscopy. The development of an understanding of anisotropy effects for flux pinning in high temperature superconductors would have both fundamental and practical implications. Classical superconductors are highly isotropic compared to the high temperature materials, so the experiments proposed here are in a new regime where dimensionality and topology play a more important role. In addition, there is a large payoff for the development of new materials and new processing methods to produce conductors with higher critical current density values. There is at present no satisfactory conductor material for magnetics because the mechanical properties and the transport critical currents are so poor. Thus, any improvement in the critical current carrying capacity of the high temperature bulk superconductors would have a large impact on the availability of new magnets and new shielding materials.