Abstract
The magnetic fountain effect occurring in superfluid 3He A1 phase is a unique phenomenon in which the pressure and magnetic field gradients in the chemical potential are balanced. The effect has been applied extensively to investigate the intrinsic spin relaxation. We constructed a new improved sample cell. The new cell includes an inner detector and an outer reservoir chamber made of "Macor" which was helpful to reduce the heat release possibly arising from proton nuclei under high magnetic fields. The measured temperature difference between the two chambers was cut to less than 5 μK. The measured relaxation time τ of the fountain pressure decreases monotonically and smoothly as the temperature is decreased from Tc1 (normal- A1 boundary) towards Tc2 (A1- A2 boundary). As the temperature approaches Tc2, τ tends to vanish smoothly.
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