Low temperature thermometry in high magnetic fields. VII. Cernox (TM) sensors to 32 T

This article describes the behavior of Cernox(TM) zirconium oxynitride film temperature sensors from Lake Shore Cryotronics, Inc. in magnetic fields u p to 32 T at temperatures between 2 and 286 K. Results from a number of sen sors with different dimensionless temperature sensitivities and from differ ent production batches are analyzed and compared with previous results on c arbon-glass sensors that extend to 19 T. In that field range, the Cernox(TM ) sensors appear to be a real alternative to carbon glass. Furthermore, the magnitude of their uncorrected error, Delta T/T, is smaller than other sen sors at most temperatures in fields less than 20 T, and their temperature c orrectabilities appear to apply to off-the-shelf sensors with dimensionless temperature sensitivities in the range of -0.74 to -1.9. The sensors show a negligible (<0.05%) orientation dependence of their Delta R/R at 78 K; at 4.2 K, that dependence can be as high as similar to 0.7% at 20 T. (C) 1999 American Institute of Physics. [S0034-6748(99)04701-2].