OBSERVATION OF STRONGLY POLARIZED LIQUID AND SOLID 3He USING THE CASTAING-NOZIERES EFFECT AND POMERANCHUK COOLINGReportar como inadecuado




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Abstract : Because of the Fermi character of liquid 3He, to polarize this system to values close to one by brute-force we should apply a field H ~ KBTF- µ ~ 200 T far too high to be produced in the laboratory for a sufficiently long time. Castaing and Nozières suggested a very elegant method of overcoming this problem which consists in polarizing solid 3He which has a magnetic susceptibility of the Curie-Weiss type and quickly melt it in a time short compared to T1, the time for the magnetization to relax. The magnetization was observed to stay in the liquid phase with a relaxation time of a few minutes. Using Pomeranchuk cooling, solid polarizations as high as 78 % were recently obtained. Because of antiferromagnetic interactions, larger solid polarizations will need higher magnetic fields. Most of the solid magnetizations can be transferred to the liquid.





Autor: G. Frossati

Fuente: https://hal.archives-ouvertes.fr/



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