Development of Low Temperature Scanning Tunneling/Magnetic Force Microscope to Observe Magnetic Flux Lattice in High Temperature Superconductor

开发用于观察高温超导体磁通晶格的低温扫描隧道/磁力显微镜

• 批准号: 06555177
• 负责人: SASAKI Katsuhiro
• 金额: $ 1.34万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555177/
• 关键词: High Temperature Superconductor; Magnetic Flux Lattice; Scanning Tunneling; Magnetic Force Microscope

The Pancake theory that is one of the famous theory to describe the behavior of the magnetic flux in a high temperature superconductor predicts the formation of the vortex-antivortex pair around the magnetic flux in the high temperature superconductor. We develop the low temperature scanning tunneling microscope which can detect the magnetic force to observe the predicted vortex-antivortex pair in the high temperature superconductor.In the first year of the project, we did(1) Theoretical research of the interaction between the cantilever of MFM and a magnetic flux in a superconductor. The appropriate condition to detect the magnetic flux by MFM was determined.(2) The low temperature scanning tunneling microscope was developed. The apparatus give the preliminary results of the surface topology of the materials at liquid helium and liquid nitrogen temperatureIn the second year of the project (i.e., the last year of the project)(1) The low temperature scanning tunneling microscope was modified to low temperature atomic force microscope. A new mechanism was developed to detect the bending of the cantilever, which can work at any temperature.(2) Several types of cantilevers which can detect variety of force, i.e., magnetic force, static electric field, lateral force, etc. : to test the performance of the developed apparatus.

Pancake理论是描述高温超导体中磁通量行为的著名理论之一，它预言了高温超导体中磁通量周围涡旋-反涡旋对的形成。本计画的第一年，我们进行了（1）超导体中磁通量与磁性微机电悬臂梁间相互作用的理论研究，并在此基础上进行了超导体中磁通量与磁性微机电悬臂梁间相互作用的理论研究。确定了磁流体力学检测磁通量的适宜条件。(2)研制了低温扫描隧道显微镜。该装置给出了在液氦和液氮温度下材料表面拓扑结构的初步结果。（1）将低温扫描隧道显微镜改造为低温原子力显微镜。设计了一种能在任意温度下工作的悬臂梁弯曲检测机构。(2)几种类型的杠杆，可以检测各种力，即，磁力、静电场、侧向力等：测试所开发装置的性能。