This experiment gives you an idea of how to make conductivity measurement in low temperature regime using a closed cycle helium cryostat, compressor, vacuum unit, chiller/re-circulator and temperture controler. The cryostat can achieve temperatures in the vicinity of 7K when subject to a vacuum of 1 mtorr. Materials like conductors, semiconductors and superconductors are subjected to such measurements.
|Sample Results||Resistivity versus temperature plot for AluminumResistivity versus temperature plot for Copper|
|Hardware Manual||Introduction to laboratory cryogenics (Janis Research)User manual for cryodyne refrigerator (CTI-Cryogenics)|
Further Readings and References
- “A method of measuring specific resistivity and Hall effect of discs of arbitrary shape Philips Res. Repts , L. J. van der Pauw , 13 1 , (1958).