Mobility of Negative Ions in Superfluid <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

A. I. Ahonen; J. Kokko; O. V. Lounasmaa; M. A. Paalanen; R. C. Richardson; W. Schoepe; Y. Takano

doi:10.1103/PhysRevLett.37.511

Mobility of Negative Ions in Superfluid ${}^{3}{He}$

A. I. Ahonen, J. Kokko, O. V. Lounasmaa, M. A. Paalanen, R. C. Richardson, W. Schoepe, and Y. Takano

Phys. Rev. Lett. 37, 511 – Published 30 August 1976

Abstract

We have found that the mobility of negative ions increases rapidly below $T_{c}$ in both superfluid ${}^{3}{He}$ phases. The ratio $\frac{μ}{μ_{N}}$ 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 30 mK and $T_{c}$ for all pressures between 0 and 28 bars.

Received 28 June 1976

DOI:https://doi.org/10.1103/PhysRevLett.37.511

Authors & Affiliations

A. I. Ahonen, J. Kokko, O. V. Lounasmaa, M. A. Paalanen, R. C. Richardson^*, W. Schoepe^†, and Y. Takano

Low Temperature Laboratory, Helsinki University of Technology, SF-02150 Espoo 15, Finland

^*Guggenheim Fellow on leave from Cornell University, Ithaca, N. Y. 14853.
^†On leave from Regensburg University, Regensburg, W. Germany; work supported by the Deutsche Forschungsgemeinschaft.