Magnetic field analysis in a diamond anvil cell for Meissner effect measurement by using the diamond NV center
Magnetic field analysis in a diamond anvil cell for Meissner effect measurement by using the diamond NV center
复制标题
使用金刚石 NV 中心进行迈斯纳效应测量的金刚石砧室中的磁场分析
DOI：
10.1088/1674-1056/28/3/030702
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Gao Chunxiao
中科院分区：
文献类型：
--
作者：
Zhao Lin;Yue Donghui;Liu Cailong;Wang Min;Han Yonghao;Gao Chunxiao
金刚石带负电荷的氮空位(NV)中心在检测磁场微小变化方面具有很高的灵敏度，为测量金刚石顶压室(DAC)中极小样品的迈斯纳效应提供了机会。本文用有限元分析方法研究了样品从正常态向超导态转变时DAC中磁场分布的变化。结果表明，样品侧壁的磁通密度变化最大，NV-中心可以检测到最强的磁场信号变化。此外，我们还研究了磁线圈的位置对磁场变化的影响。研究发现，线圈产生最大磁场强度变化的最佳位置是尽可能靠近样品的位置。
Diamond negatively charged nitrogen-vacancy (NV) centers provide an opportunity for the measurement of the Meissner effect on extremely small samples in a diamond anvil cell (DAC) due to their high sensitivity in detecting the tiny change of magnetic field. We report on the variation of magnetic field distribution in a DAC as a sample transforms from normal to superconducting state by using finite element analysis. The results show that the magnetic flux density has the largest change on the sidewall of the sample, where NV~- centers can detect the strongest signal variation of the magnetic field. In addition, we study the effect of magnetic coil placement on the magnetic field variation. It is found that the optimal position for the coil to generate the greatest change in magnetic field strength is at the place as close to the sample as possible.