Pressure cyst for AC magnetic capacity measurement and pressing device and AC magnetic capacity measuring systems thereof

Abstract

The invention relates to a pressure cell for measuring the AC magnetic susceptibility of a single crystal material, which includes an upper indenter, a lower indenter, a coil frame, a primary coil, and two sets of secondary coils, wherein the upper and lower indenters of the T-shaped section are respectively equipped with The disc-shaped base and the central extension part have a through hole in the center of the king-shaped coil skeleton, the lower part of which mechanically cooperates with the central extension part of the inverted lower pressure head, and the upper part mechanically cooperates with the central extension part of the upper pressure head. A spring is set between the upper end of the frame and the upper pressure head to adjust the upper and lower positions of the upper pressure head. The entire outer side of the king-shaped frame is covered with a primary coil, and the primary coil is respectively sleeved between the upper and lower concave inner sides of the frame. There is a secondary coil, and the upper and lower pressure heads are detachably assembled with the coil frame respectively. The present invention also provides a temperature-changing AC magnetic susceptibility measurement system that uses the pressure cell and the pressure device to apply uniaxial pressure to the sample simultaneously. The advantages of the present invention are simple and direct, no pressure calibration, simple pressurization method and light weight , Small size, simple and compact design. It can measure the AC magnetic susceptibility signal of single crystal with very small size.

Description

technical field [0001] The present invention relates to the measurement of magnetic susceptibility, in particular, to a pressure cell for measuring AC magnetic susceptibility, a device for applying uniaxial pressure to the pressure cell, and using the pressure cell and the device for applying pressure to measure materials, especially single crystal A measurement system for the AC magnetic susceptibility of materials. Background technique [0002] The transport properties of transition metals and rare earth compounds, such as electrical and magnetic properties, are closely related to their electronic states, and their electronic states are easily affected by chemical internal pressure, external hydrostatic pressure, external directional pressure, external magnetic field and so on. External hydrostatic pressure can continuously compress the unit cell volume, thereby increasing the bandwidth, thus changing the electronic state of the sample. If pressure is applied along a sin...

AI Technical Summary

Problems solved by technology

However, at present, due to the anisotropy of single crystal samples, it is necessary to measure the single crystal magnetic susceptibility in all directions, and there is no set of pressure cells and pressure cells that can measure the AC magnetic susceptibility of single crystal materials under uniaxial pressure. AC magnetic susceptibility measurement device. Therefore, in order to study the anisotropy of single crystal materials, it is necessary to establish a set of measurement devices that can measure the AC magnetic susceptibility of single crystal samples under uniaxial pressure under external temperature changes or external magnetic field environments.

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