Anomalous Magnetic-Field Dependence of Positive Ion Mobility in Normal LiquidH3e

Abstract

The positive ion mobility in normal liquid (3)He has been measured as a function of external magnetic field up to 15 T at temperatures down to 3 mK. At 3.2 mK, the field dependence is found to exhibit a pressure-dependent broad peak followed by a large decrease at pressures above 20 bars. On the other hand, at 20 mK, a monotonic decrease with increasing the magnetic field has been observed in the same pressure region. Possible origins for these anomalous behaviors are discussed.

Positive ion mobility in superfluid3Heunder high magnetic fields

“…3͑b͔͒. 7 In the A 2 phase, (0)/(H) shows a larger increase in the high field region, and a small dip is much clearer than in the normal phase. On the contrary, the behavior in the A 1 phase is different from in the A 2 phase as shown in Fig.…”

“…The experimental setup is the same as that in our previous work. 7,9 The magnetic field is parallel to the ion velocity. In this geometry, the l vector in the A phase lies in the plane perpendicular to the ion velocity.…”

“…However the effect is not large enough to derive the observed increase of the inverse mobility. 7 The other possible cause could be the localized 3 He spins on the positive ion surface. The magnetization is determined by a various antiferro-and ferromagnetic multiple spin exchange interactions among the localized spins just like in the bulk bcc solid 3 He or two dimensional solid 3 He.…”