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A thermomechanical effect has been found in normal liquid3He. The effect appears only when the temperature gradient is established across liquid3He confined in small pores so that the3He quasiparticle scattering is boundary limited. This was achieved with a porous plug of packed 70 nm copper-oxide powder. The magnitude of ΔP/gDT varies from 4 C at 2 mK to ∼C at 20 mK, where P is pressure, T is temperature and C is the heat capacity per unit volume. The sign is positive, meaning that the3He “moves” from cold to hot. If viewed as an analogue of thermoelectricity, the magnitude of this thermomechanical effect is unsurprising. However, as shown in the following paper, it is an order of magnitude larger than a theoretical prediction for liquid3He.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 22, 2004
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