Magnetoresistance below 1 K and temperature cycling of ruthenium oxide–bismuth ruthenate cryogenic thermometers
✍ Scribed by R.G Goodrich; Donavan Hall; Eric Palm; Tim Murphy
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 212 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0011-2275
No coin nor oath required. For personal study only.
✦ Synopsis
The magnetic field dependence of the resistance of commercial 1000 ⍀ thick film chip resistors between 0.03 and 0.6 K in fields from zero to 18 T for five resistors and up to 32 T for one of those five shows both a positive and a negative magnetoresistance that is temperature dependent. In the field range between 4 and 32 T, and over the temperature measurement range, the resistance is proportional to B 1/2 , and once an individual thermometer is calibrated, it can easily be used to determine the temperature at any field within the range. Measurements of the effect of repeated thermal cycling of these resistors from 300 to 77 and 4.2 K show that the resistance continually changes up to 120 cycles to 77 K or below then becomes stable.