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 susceptibility of monocrystal materials, comprising an upper pressure head, a lower pressure head, a coil framework, a primary coil, tow sets of secondary coils, wherein the upper pressure head and the lower pressure head, both of which have a T-shaped cross section, are provided with a round base and a central stretched-out part; the coil framework shaped like a Chinese character 'wang' is provided with a through hole in the center; the lower part of the coil framework is in mechanical fit with the central stretched-out part of the inverted lower pressure head; the upper part of the coil framework is in mechanical fit with the central stretched-out part of the upper pressure head; a spring is sleeved between the upper end of the coil framework and the upper pressure head to adjust the up and down positions of the upper pressure head; the primary coil is covered on the entire outside of the framework shaped like a Chinese character 'wang'; the secondary coils are respectively sleeved between the primary coil and the inner side of the upper concave part of the framework and between the primary coil and the inner side of the lower concave part of the framework; the upper pressure head and the lower pressure head can be detachably assembled with the coil framework respectively. The invention also provides system for measuring the ac susceptibility with variable temperature synchronously as the pressure cell and a pressurizing device apply uniaxial compressive force on a sample. The invention has the advantages of being simple and direct, requiring no pressure calibration, having simple pressurization mode, along with light weight, small volume and simple and compact design. The invention can measure the ac susceptibility of the monocrystal of extremely 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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