Magnetic field analysis in a diamond anvil cell for Meissner effect measurement by using the diamond NV<sup>–</sup> center<xref rid="cpb_28_3_030702fn1" ref-type="fn">*</xref><fn id="cpb_28_3_030702fn1"><label>*</label><p>Project supported by the National Key R&D Program of China (Grant No. 2018YFA0305900) and the National Natural Science Foundation of China (Grant Nos. 11774126, 11674404, and 51772125).</p></fn>

Magnetic field analysis in a diamond anvil cell for Meissner effect measurement by using the diamond NV^– center**

Project supported by the National Key R&D Program of China (Grant No. 2018YFA0305900) and the National Natural Science Foundation of China (Grant Nos. 11774126, 11674404, and 51772125).

Zhao Lin, Yue Donghui, Liu Cailong, Wang Min, Han Yonghao^†, Gao Chunxiao

The variations of magnetic flux intensity along the surfaces of different horizontal cross sections of the samples. The permeabilities of the samples are (a) 1000 H/cm and (b) 1 H/cm, respectively.