Abstract
Experimental methods and preliminary results of high-precision measurements of the 3 He melting curve in high magnetic fields have been described. The purpose of this work is twofold. One is to establish a reliable millikelvin temperature scale in high fields (T ≥ 10 mK, B ≤ 15 T), The other is to investigate a high field region of the magnetic phase diagram of solid 3 He by measuring the melting pressure down to temperatures below 1 mK. Besides the two superfluid transitions, the phase transition temperatures between the spin ordered solid and the paramagnetic solid, T HFP , were determined at B = 12 and 10 T with good accuracy, which is an extension of previous measurements up to 8 T. The present T HFP (B) line can not be scaled to that at a higher density with a single Grüneisen parameter, indicating a variation of density dependencies of the multiple-spin exchange interactions.
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Yawata, K., Ito, D., Ikegami, H. et al. 3He Melting Pressure Measurements in High Magnetic Fields. Journal of Low Temperature Physics 113, 769–774 (1998). https://doi.org/10.1023/A:1022526116533
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DOI: https://doi.org/10.1023/A:1022526116533