Note: Improved sensitivity of magnetic measurements under high pressure in miniature ceramic anvil cell for a commercial SQUID magnetometer

Naoyuki Tateiwa,Tatsuma D Matsuda,Shugo Ikeda,Yoshinori Haga,Zachary Fisk,Hisao Kobayashi

doi:10.1063/1.4802832

Abstract

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.

Highlights

Title Note: Improved sensitivity of magnetic measurements under high pressure in miniature ceramic anvil cell for a commercial SQUID magnetometer
Readers can refer to Refs. 1 and 2 for details of the mCAC and the current status of the pressure cells developed for the SQUID magnetometer
A problem in the mCAC is that the background magnetization is small at higher temperatures, the absolute value increases with decreasing temperature below 10 K, which is disadvantageous for the high pressure study in the low temperature physics

Summary

Introduction

Title Note: Improved sensitivity of magnetic measurements under high pressure in miniature ceramic anvil cell for a commercial SQUID magnetometer. Note: Improved sensitivity of magnetic measurements under high pressure in miniature ceramic anvil cell for a commercial SQUID magnetometer We have proposed a miniature ceramic-anvil high-pressure cell for magnetic measurements at pressures above 10 GPa in a commercial superconducting quantum interference (SQUID) magnetometer.1–3 This cell is abbreviated as mCAC.

Results

Conclusion