Transport Measurements
Transport measurements are possible in combination with optical irradiation and microwave irradiation. They can be done as a function of temperature, pressure and/or the angle between the sample and the magnetic field. The ranges of several parameters that can be varied as resistance is measured are shown in the table below. The parameters listed cannot all be varied simultaneously in all situations. People with special requirements should contact contact Interim DC Program Director Tim Murphy.
Table of Parameter Space Available for Resistance Measurements
|
|
Magnet Type
|
Bore
|
Maximum Field
|
Temperature Range (K)
|
Maximum Pressure
|
Angle Range
|
|
Resistive
|
50 mm
|
31 T
|
0.3 to 300
|
8 GPa
|
360º
|
|
Resistive
|
32 mm
|
45 T
|
30mK to 300K
|
8 GPa
|
360º
|
|
Superconducting
|
52 mm
|
20 T
|
0.02 to 1.01
|
8 GPa
|
360º
|
|
Superconducting
|
52 mm
|
20 T
|
0.3 to 320
|
8 GPa
|
360º
|
|
1 Temperatures to 0.5mK are available. See our High B/T Facility.
For information on pulsed magnets, visit the Measurement Guides on our Pulsed Field Facility pages.
Transport measurements require the highest fields, low vibration, field reversal, temperatures from as low as possible to above room temperature and a good ground. The Magnet Lab has taken extra steps in the design and construction of all of its facilities to minimize vibration and magnetic field ripple and to provide a good ground for low-noise measurements.
Standard equipment available includes such things as low frequency lock-in amplifiers, very sensitive digital voltmeters and preamplifiers with negligible pump out current at the input leads (especially of digital noise).
Many Magnet Lab sample holders use standard non magnetic 8 or 16 pin DIP sockets for holding the samples. The leads chosen as twisted pairs can easily be arranged to suit the user's sample mount.
