High B/T Measurement Techniques

Thermometry

Thermometry

Four kinds of thermometry are available at the High B/T Facility: capacitance, melting curve, Pt NMR, and vibrating wire thermometry.

AC Electrical Conductivity in High B/T

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.

AC Magnetic Susceptibility in High B/T

The AC susceptometer for measurements at ultra-low temperatures consists of a cell totally immersed with the sample in a cell filled with liquid 3He.

Acoustic Impedance in High B/T

For highly attenuating materials, transmission measurement is difficult to use. We offer an acoustic impedance measurement capability which is valuable in detecting transition signatures.

High-sensitivity Dielectric Measurement in High B/T

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.

Pulse-Echo Ultrasound in High B/T

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.

Ultra Low-Temperature NMR and NQR in High B/T

Two superheterodyne computer interfaced pulsed NMR spectrometers are available for broadband applications.