提高商用SQUID磁力计微型陶瓷压砧高压下磁性测量的灵敏度
Improved sensitivity of magnetic measurements under high pressure in miniature ceramic anvil cell for a commercial SQUID magnetometer
摘要：
本文对一种微型陶瓷砧高压室（mCAC）作了两处改进，该高压室是为在12.6GPa压力下测量超导量子干涉（SQUID）磁强计的磁场而设计的[N. Tateiwa等人，Rev. Sci.仪器82，053906（2011）.，同上，83，053906（2012）]。用由Cu-Be和陶瓷圆柱体组成的复合活塞取代前mCAC中的Cu-Be活塞，在低温下显著减小了背景磁化，从而能够在低温下进行更精确的磁性测量。对mCAC的第二个修改是利用在底脚表面中心具有中空的陶瓷砧。使用底脚尺寸为1.0 mm的“杯状陶瓷砧”产生高达5 GPa的高压。
英文摘要：
Two modifications have been made to a miniature ceramic anvil high pressure cell (mCAC) designed for magnetic measurements at pressures up to 12.6 GPa in a commercial superconducting quantum interference (SQUID) magnetometer [N. Tateiwa et al., Rev. Sci. Instrum. 82, 053906 (2011)., ibid. 83, 053906 (2012)]. Replacing the Cu-Be piston in the former mCAC with a composite piston composed of the Cu-Be and ceramic cylinders reduces the background magnetization significantly smaller at low temperatures, enabling more precise magnetic measurements at low temperatures. A second modification to the mCAC is the utilization of a ceramic anvil with a hollow in the center of the culet surface. High pressures up to 5 GPa were generated with the "cupped ceramic anvil" with the culet size of 1.0 mm.
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