Conveners
M2PoA - Materials I: Physical Properties
- David Evans (Advanced Cryogenic Materials Ltd.)
- Karl Hartwig (Texas A&M University)
In this work, we investigate the Metal-Insulator Transition (MIT) at very low temperature in presence of magnetic field using the competition between the relevant scale lengths determining the behavior of the electrical conductivity with low temperature in the both sides of the MIT. The MIT is induced by applying high magnetic field in 3D InP semiconductor sample. The scale lengths taking in...
The insulation materials used in the high field fusion magnets should be characterized by excellent mechanical properties, high electrical breakdown strength, good thermal conductivity and high radiation resistivity. Previous investigations by the authors showed that cyanate ester/epoxy (CE/EP) insulation material, a candidate insulation material for the fusion magnet, can maintain good...
Cable-in-conduit conductors of the ITER magnet system are directly cooled by supercritical helium. Insulation breaks are required in the liquid helium feed pipes to isolate the high voltage system of the magnet windings from the electrically grounded helium coolant supply line. They are submitted to high voltages and significant internal helium pressure and will experience mechanical forces...
Development of novel electrical insulation is vital for successful fabrication of (S)-Insulator (I)-Superconductor(S) Josephson junctions and related devices that have potential applications in quantum computing, superconducting quantum interference devices (SQUIDs), single-electron transistors, remote sensors, and terahertz frequency (THz) signal generating and detecting devices. YBa2Cu3O7...
In this work we tune the critical current for an Nb film with a rectangular array of antidots using a commercially available physical properties measurement system by varying several parameters, including temperature, magnetic flux, and current. Our measurements show variation in resistance through dips in the curves, which resemble Shapiro steps [1]. Since repeatedly performing such...
The electrical insulation materials for use in ITER magnets and feeder system are required high voltage electrical breakdown strength. In order to develop good property insulation materials to satisfy the requirements of superconducting magnets, high voltage breakdown strength measurement system at low temperature is necessary. The high voltage breakdown strength measuring system in 1.8K with...
Thermal expansion and magnetostriction, the strain responses of a material to temperature and a magnetic field, especially properties at low temperature, are extremely useful to study electronic and phononic properties, phase transitions, quantum criticality, and other interesting phenomena in cryogenic engineering and materials science. However, traditional dilatometers can not provide...
We have investigated the electrical transport properties of the insulating three-dimensional samples 70Ge: Ga p-type in the temperature range 0.05-2.7 K and in the absence of the magnetic field. The fourteen samples studied have Ga concentrations N ranging from 0.302 × 1017 to 1.84 × 1017 cm-3. On the insulating side of the transition, the study of the effect of low Temperature T on the...
