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

Magnetic flux density distributions with different coil positions. The coil is (a) on the gasket and as close to the sample as possible, (b)–(d) moved away from the sample horizontally and vertically.