Rotational Magnetic Processes in Type-II Superconductors

II 型超导体中的旋转磁过程

• 批准号: 9221901
• 负责人: James Kouvel
• 金额: $ 10万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221901&HistoricalAwards=false
• 关键词: Rotational; Magnetic; Processes; Type; II

For various superconducting single crystals and polycrystals (including those of high-Tc compounds), the magnetization will be measured as a two-dimensional vector as the sample is rotated in a fixed magnetic field. These measurements seperate the diamagnetic shielding component of the magnetization, leaving the penetrating vortex-flux magnetization, whose frictional rotational behavior is related to vortex pinning forces that govern the critical current in these materials. The viscous response of the penetrating vortex-flux magnetization will also be investigated. For the single cystals, the measured anisotropy on the rotational magnetic properties will provide a full characterization of the unusual modes of vortex-flux behavior (including cross-flux effects) previously found in these studies. %%% The magnetic polarization of various superconducting materials (including those of high critical temperatures) will be measured as they are rotated in a magnetic field of different strengths. The frictional magnetic forces determined by these measurements are directly related to the maximum electic current that the materials can carry without losing their superconductivity. This information is needed to asses the technical potential for applications of these materials.

用于各种超导单晶和多晶 （包括那些高Tc化合物），磁化将是 当样品在旋转方向上旋转时， 固定磁场 这些测量将反磁性物质 屏蔽组件的磁化，离开穿透 涡旋磁通磁化，其摩擦旋转行为是 与控制临界电流的涡旋钉扎力有关 在这些材料中。 渗透的粘性响应 还将研究涡旋通量磁化。 为 单晶体，测量的旋转磁各向异性 属性将提供一个不寻常的充分表征 涡通量行为模式（包括交叉通量效应） 在这些研究中发现。 %%% 各种超导材料的磁极化 （包括高临界温度）将被测量为 它们在不同强度的磁场中旋转。 的 通过这些测量确定的摩擦磁力是 直接关系到材料的最大电流 可以携带而不会失去超导性。 这些信息 需要评估应用的技术潜力， 这些材料。