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

TL;DR

This paper presents two modifications to a miniature ceramic anvil high pressure cell that significantly improve magnetic measurement sensitivity under high pressure in a SQUID magnetometer.

Contribution

The study introduces a composite piston and a hollow culet ceramic anvil to enhance measurement precision and pressure capabilities in a miniature high pressure cell.

Findings

Reduced background magnetization at low temperatures.

Achieved pressures up to 5 GPa with the new cupped ceramic anvil.

Enhanced measurement accuracy at high pressures.

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.