The Mobility of Negative Ions in Superfluid 3He
We have found that the mobility of negative ions increases rapidly below Tc in both superfluid 3He phases. The ratio μ/μN of superfluid to normal mobility is larger in the B phase than in the A phase. A critical velocity consistent in magnitude with the Landau limit for pair breaking has also been observed. In the normal fluid we find a temperature independent mobility between 40 mK and Tc for all pressures between 0 and 28 bar. The increase of μN with increasing pressure is in agreement with the bubble model for the negative ion.
KeywordsDrift Velocity Normal Mobility Pair Breaking Superfluid Phase Bubble Model
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