Superfluidity of a Dilute ³He-⁴He Solution

Abstract

The interaction between two 3He atoms is calculated by taking into account the backflow effect of 3He by the 4He in the 3He_ 4He mixture.The effect contributes solely to the P wave part of the interaction.The repulsive S wave part of the contact interaction contributes to the exchange interaction between the 3He atoms, while the direct one phonon exchange interaction contributes both to the Sand P wave attractive interactions.The overall contribution to the attractive interaction is dominated by the P wave part and the superfiuidity in the P wave is more predominant than in the S wave for the 5 % dilute 3He Y He solution, and vice versa for the 1.3 % solution. 1. Introduction