transport

Transport

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 discuss them with one of the contact people listed at the end of this document.

Table of Parameter Space Available for Resistance Measurements

Magnet Type
bore dia.  Maximum       Temperature
Ra  Maximum           Angle Range    
                       Field (T)     nge (K)         Pressure (GPa)    (degrees)      
Pulsed, 24 mm               62       30 mK to 310          2.5              180       
Pulsed, 14 mm               70       1.6 K to 310           NA               0        
Resistive, 50 mm            20       0.5 to 300             8               360       
Resistive, 32 mm            30       0.5 to 300             8               360       
Supercond1, 53 mm          19.5      .03 to 310             8                0        
Supercond2, 52 mm           20       .02 to 1.0             8               360       
Supercond2, 52 mm           20       0.4 to 300             8               360       
Supercond3, 52 mm          "20"      0.0005 to 0.1          NA              NA

¹Located in Los Alamos

²Located in Tallahassee

³Located in the Ultra High B/T Facility in Gainesville

Transport measurements require the highest fields, low vibration, field reversal, temperatures from as low as possible to above room temperature, and a good ground. NHMFL 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 NHMFL 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.

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Curator: Scott Hannahs <sth@magnet.fsu.edu>
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