Turnbuckle diamond anvil cell for high-pressure measurements in a superconducting quantum interference device magnetometer

Abstract

We have developed a miniature diamond anvil cell for magnetization measurements in a widely used magnetic property measurement system commercial magnetometer built around a superconducting quantum interference device. The design of the pressure cell is based on the turnbuckle principle in which force can be created and maintained by rotating the body of the device while restricting the counterthreaded end-nuts to translational movement. The load on the opposed diamond anvils and the sample between them is generated using a hydraulic press. The load is then locked by rotating the body of the cell with respect to the end-nuts. The dimensions of the pressure cell have been optimized by use of finite element analysis. The cell is approximately a cylinder 7 mm long and 7 mm in diameter and weighs only 1.5 g. Due to its small size the cell thermalizes rapidly. It is capable of achieving pressures in excess of 10 GPa while allowing measurements to be performed with the maximum sensitivity of the magnetometer. The performance of the pressure cell is illustrated by a high pressure magnetic study of Mn(3)[Cr(CN)(6)](2) x xH(2)O Prussian blue analog up to 10.3 GPa.

Nonlinear pressure dependence ofTNin almost multiferroic EuTiO3

“…Measurements of the temperature dependence of the magnetic moment m for the sample EuTiO 3 were performed with a commercial SQUID magnetometer (Quantum Design MPMS-XL). Investigations were carried out at ambient as well as under applied pressures up to p = 57 kbar using a diamond anvil cell (DAC) [23] filled with Daphne oil which served as a pressure-transmitting medium. The pressure at low temperatures was determined by the pressure dependence of the superconducting transition temperature of Pb.…”

High pressure neutron and X-ray diffraction at low temperatures

“…This dramatically increases the typical opening angle, with the thinner diamonds also reducing beam attenuation for soft (low energy) X-rays. In addition to these advances in anvil support design, the concept of placing one set of anvils between another set of anvils has also been investigated [163], where pressures up to 640 GPa have been generated on a tiny sample volume. This used black carbon hemispheres, which at high temperature and a pressure of 20 GPa converts into polycrystalline diamond.…”

A compact bellows-driven diamond anvil cell for high-pressure, low-temperature magnetic measurements

“…3 The essential elements of such a DAC consist of either cylindrical surfaces or pins to provide sliding alignment of the opposing anvils, seats and/or rockers for providing support and lateral and rotational alignment of the anvils, gaskets for maintaining a relatively homogeneous sample environment, access windows into the pressure chamber, and some method for applying force for sealing and pressurization. The pressurization method typically consists of Belleville disk springs, a split spring, 3,5 or a turnbuckle, 6,7 and possibly a lever arm 1 or a helium membrane/bellows actuator for in situ adjustment of the pressure. 4,8 Miniature DAC systems have been developed with crosssectional diameters under 9 mm 6,7 for magnetization measurements in the tight confines of a superconducting quantum interference device (SQUID) magnetometer.…”

“…The pressurization method typically consists of Belleville disk springs, a split spring, 3,5 or a turnbuckle, 6,7 and possibly a lever arm 1 or a helium membrane/bellows actuator for in situ adjustment of the pressure. 4,8 Miniature DAC systems have been developed with crosssectional diameters under 9 mm 6,7 for magnetization measurements in the tight confines of a superconducting quantum interference device (SQUID) magnetometer. In order to fit the tight space constraints, the cell designs must simplify or eliminate many general components of a DAC system.…”

“…[1][2][3][4][5][6][7] Among all high-pressure vessels, diamond anvil cells (DAC) are most commonly used due to the combination of a large accessible pressure range and a relatively compact structure. Although early designs could be cumbersome, 1, 2 a contemporary full sized diamond anvil cell is typically 2 in.…”