Magnetic measurements at pressures above 10 GPa in a miniature ceramic anvil cell for a superconducting quantum interference device magnetometer
Naoyuki Tateiwa, Yoshinori Haga, Tatsuma D Matsuda, Zachary Fisk
TL;DR
This paper presents methods to achieve pressures above 10 GPa using a miniature ceramic anvil cell for SQUID magnetometry, enabling precise magnetic measurements of materials under high pressure.
Contribution
It introduces improved pressure generation techniques in the mCAC, reaching up to 13 GPa, and demonstrates its application in detecting magnetic phase transitions in YbCu2Si2.
Findings
Maximum pressure of 13 GPa achieved with preindented Cu-Be gasket.
Successful detection of ferromagnetic transition in YbCu2Si2 at 8 GPa.
High sensitivity allows detection of magnetic moments smaller than 1 μB per unit cell.
Abstract
A miniature ceramic anvil high pressure cell (mCAC) was earlier designed by us for magnetic measurements at pressures up to 7.6 GPa in a commercial superconducting quantum interference (SQUID) magnetometer [N. Tateiwa et al., Rev. Sci. Instrum. 82, 053906 (2011)]. Here, we describe methods to generate pressures above 10 GPa in the mCAC. The efficiency of the pressure generation is sharply improved when the Cu-Be gasket is sufficiently preindented. The maximum pressure for the 0.6 mm culet anvils is 12.6 GPa when the Cu-Be gasket is preindented from the initial thickness of 0.30 to 0.06 mm. The 0.5 mm culet anvils were also tested with a rhenium gasket. The maximum pressure attainable in the mCAC is about 13 GPa. The present cell was used to study YbCu2Si2 which shows a pressure induced transition from the non-magnetic to magnetic phases at 8 GPa. We confirm a ferromagnetic transition…
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