High magnetic field corrections to resistance thermometers for low temperature calorimetry

We present a general analytical method of correcting for magnetic-field-induced changes in both the apparent temperature and the sensitivity of resistive thermometers at dilution refrigerator temperatures. With this method, we are able to reduce magnetic field induced errors in temperature to a level limited only by our ability to regulate the temperature in the absence of a magnetic field. We illustrate the application of our method to two resistive sensors in magnetic fields up to 18 T: a custom-made Au_xGe_1-x thin film sensor used in calorimetry and a commercially available ruthenium-oxide thick film resistor used in thermometry.