Abstract
Measurements of magnetic field-induced changes in hydrostatic head corrections are reported for columns of liquid N 2 and Ar at their normal boiling points and for liquid He 4 between 2.15 and 4.2 K, in static magnetic fields to 15 T. The results for very high purity N 2 and Ar are in good agreement with calculations based on gas susceptibilities; diamagnetic coolings of − 32 ± 1.5 and − 64 ± 6 mK are observed for liquid N 2 and Ar respectively, at 15 T. However, O 2 contamination in amounts as small as 0.1 at % can drastically after the observed temperature changes. The measurements on He 4 above 3 K are also in good agreement with calculations based on the diamagnetic gas susceptibility. Below 3 K, the results deviate from the calculation in a paramagnetic direction; just above the λ-point, paramagnetic warnings of ∼ 10 mK are observed for a field of 15 T.
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