Viscosity of polarized liquid3He studied by NMR and related thermodynamics |
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| Authors: | G. A. Vermenulen A. Schuhl F. B. Rasmussen J. Joffrin M. Chapellier |
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| Affiliation: | (1) Laboratoire de Physique des Solides, University of Paris-Sud, Orsay, France;(2) Present address: Service de Physique Du Solide et Résonance Magnétique, Départment de Physique Générale, Institut de Recherche Fondamentale du Commissariat à l'Energie Atomique, Orme des Merisiers, 91191 Gif-sur-Yvette, France;(3) Present address: Laboratoire de Physique, Ecole Normale Supérieure, 24 Rue Lhomond, 75231 Paris Cedex 05, France;(4) Present address: Physics Laboratory, H. C. Ørsted Institute, Universitetsparken 5, DK-2100 Copenhagen, Denmark |
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| Abstract: | A new method to measure the magnetization dependence of the viscosity in polarized liquid3He is presented. The magnetization is obtained by  brute force polarization at 50 mK in magnetic fields up to 11 T; it is subsequently destroyed by saturation of the NMR signal. Irreversible heating due to the saturation and relaxation of the magnetization is easily observed using the viscometer. Comparison of the calculated temperature evolution with the behavior of the viscometer shows that the viscosity is slightly magnetization dependent. Our result, a relative increase of the viscosity of 0.3±0.15% for a polarization of 3.9% and a pressure of 30 bar, disagrees with a prediction based on the nearly metamagnetic model and the first measurement based on the rapid melting of polarized solid. |
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