高压物理学报2026，Vol.40Issue(4)：60-67,8.DOI:10.11858/gywlxb.20261050
金刚石压砧中调制磁化率的测量原理
Measurement Principle of Modulated Magnetic Susceptibility in Diamond Anvil
周亚洲 1郭静 1陈姝蓉2
作者信息
- 1. 中国科学院物理研究所,北京 100080
- 2. 河海大学机电工程学院,江苏 南京 210024
- 折叠
摘要
Abstract
Superconductivity is defined by two fundamental criteria:zero electrical resistance and the Meissner effect.However,measuring the magnetic properties of samples under high pressure in diamond anvil cells—where sample sizes are limited to tens of micrometers and confined spatially—has long been a challenging task in high-pressure research.Magnetic measurements under high pressure using diamond anvil cells can generally be classified into four distinct methods.Among these,the modulated magnetic susceptibility measurement,which employs laboratory-fabricated multi-turn micro-coils and two lock-in amplifiers connected in series,has often yielded contradictory experimental results in the literature due to an insufficient understanding of its underlying measurement principles.In this work,starting from the experimental configuration and Faraday's law of electromagnetic induction,we re-derive the expressions for the signal magnitude of the superconducting diamagnetic transition registered on the primary and secondary lock-in amplifiers.We obtain an expression for the signal amplification introduced by the modulated magnetic field,thereby clarifying the measurement principle of modulated magnetic susceptibility and identifying potential issues in previous studies.关键词
金刚石压砧/磁化率测量/调制磁化率/超导抗磁信号Key words
diamond anvil cell/magnetic susceptibility measurement/modulated magnetic susceptibility/superconducting diamagnetic signal分类
数理科学引用本文复制引用
周亚洲,郭静,陈姝蓉..金刚石压砧中调制磁化率的测量原理[J].高压物理学报,2026,40(4):60-67,8.
