A millikelvin temperature scale in high magnetic fields based on 3He melting pressure

We propose a new millikelvin temperature scale (3.5 mK≤T≤250 mK), which can be used in high magnetic fields (B≤14.5 T), based on the melting pressure of 3He. The new scale is defined by a set of three equations which gives a melting pressure decrease due to application of B at a fixed T. The estimated accuracies of this scale are ±0.1% and ±0.4% above and below 10 mK, respectively, besides uncertainties in the existing zero-field 3He melting curve T-scale we stand for. It is useful to calibrate other more convenient thermometers in situ of high fields