Rotational Magnetic Processes in Type-II Superconductors

对于各种超导单晶和多晶（包括高tc化合物），当样品在固定磁场中旋转时，磁化强度将作为二维矢量测量。这些测量分离了磁化的抗磁屏蔽成分，留下穿透涡流磁通磁化，其摩擦旋转行为与控制这些材料中临界电流的涡流钉住力有关。对穿透涡旋磁化的粘性响应也进行了研究。对于单晶，测量的旋转磁性的各向异性将提供先前在这些研究中发现的涡通量行为的不寻常模式（包括交叉通量效应）的完整表征。当各种超导材料（包括临界温度较高的材料）在不同强度的磁场中旋转时，将测量它们的磁极化。由这些测量确定的摩擦磁力与材料在不失去其超导性的情况下所能携带的最大电流直接相关。需要这些资料来评估这些材料应用的技术潜力。

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.