A-B Phase Conversion and Coexistence of Superfluid He in Aerogel

We have studied phase transition of superfluid He at 2.4 MPa in cylindrical aerogel by NMR method. When the liquid is cooled down from the normal state, the A-like phase appears below superfluid transition temperature T c which is suppressed in comparison with the transition temperature of the bulk...

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Published in:Journal of low temperature physics 2008-02, Vol.150 (3-4), p.472-475
Main Authors: Kado, R, Nakagawa, H, Obara, K, Yano, H, Ishikawa, O, Hata, T
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Nakagawa, H
Obara, K
Yano, H
Ishikawa, O
Hata, T
description We have studied phase transition of superfluid He at 2.4 MPa in cylindrical aerogel by NMR method. When the liquid is cooled down from the normal state, the A-like phase appears below superfluid transition temperature T c which is suppressed in comparison with the transition temperature of the bulk liquid. With further cooling below the certain temperature T ab,c , the A-like phase is converted into the B-like phase gradually. Both phases stably coexist within about 90 muK. When you keep the temperature constant in which both phases coexist, the A-B phase conversion stops. With furthermore cooling, the whole liquid becomes the B-like phase. The cwNMR spectra at the coexistence state suggest that the B-like phase is not uniformly distributed in the A-like phase like a large number of small bubbles in a liquid, but separated as a whole from the A-like phase. By applying a field gradient which changes as a function of square of radius, we found that the A-like phase is in the edge part with a cylindrical shape and the B-like phase is in the central part with a columnar shape.
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title A-B Phase Conversion and Coexistence of Superfluid He in Aerogel
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