How to find magneto-resistance of TVO temperature sensors in the range 0.1–10 K Original Research Article

An empirical method is presented to calculate magneto-resistance (MR) and a corresponding temperature shift of the well known TVO temperature sensors in the ranges from 0.1 K to approximately 10 K and up to 8 T. Features of MR, depending on the temperature and magnetic field, are discussed. The maximum positive MR-values, depending on the magnetic field, correspond to the temperature of T ≈ 0.67 K: 12.5% at 8 T. At the fixed magnetic field the zero MR-value is reached both by increasing or decreasing the temperatures with respect to 0.67 K. For example, at the magnetic field of 4 T, the zero MR-value appears at T ≈ 0.2 K and T ≈ 6 K. A constant moderate negative relative MR of 19%, which does not depend on the magnetic field from 2 to 8 T, is revealed at T ≈ 0.1 K. In the ranges from 1.5 to 4.4 K and from 0 to 9 T, in particular, the temperature shift has a linear dependence on B-value and inverse proportionality on the dimensionless sensitivity S. A brief explanation of the behavior of TVO sensors under magnetic fields is presented as well.