High B/T Measurement Techniques
Measurements of the electrical conductivity of materials such as 2D electron systems are carried out using low frequency A.C. measurements using 4 or 6 wire measurements and high sensitivity lock-in amplifiers.
For highly attenuating materials, transmission measurement is difficult to use. We offer an acoustic impedance measurement capability which is valuable in detecting transition signatures.
The high-sensitivity dielectric probe is designed for measuring the dielectric constants of quantum materials at low temperatures. It has been used to measure the dielectric constants of quantum fluid of helium and quantum magnetic materials down to 1mK.
Absolute attenuation and sound velocity can be measured through direct propagation of ultrasound pulses in a wide range of temperature and magnetic field from: 0.1mK to1K and up to 8T magnetic field.