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TT: Tiefe Temperaturen
TT 22: Symposium Quantum Fluids
TT 22.1: Hauptvortrag
Dienstag, 28. März 2006, 15:00–15:30, HSZ 304
A-B Transition and Anisotropic Scattering in Superfluid 3He in Aerogel — •Yoonseok Lee — Department of Physics, University of Florida, PO Box 118440, Gainesville, FL 32611, USA
For last 10 years, liquid 3He impregnated in high porosity silica aerogel has been investigated extensively. The structure and relevent length scales of the aerogel allow us to investigate the effects of disorder on a p-wave superfluid in a systematic manner. In 98% porosity aerogel, three distinct phases have been observed experimentally. These three phases are conveniently named as A-, B-, and A1-phase as in the bulk, although only spin structures of the superfluid phases have been identified. Especially, the verdict on the so called A-phase is by no means conclusive. However, a considerable modification in the phase diagram has been reported such as the supression of superfluid transition and a severe alteration in the A-B transition line. In this talk, we will review recent experimental results on the A-B transition in 98% aerogel including our own results and discuss the importance of anisotropic scattering provided by the strand-like structure of aerogel on the A-B transtion.