Abstract
We have attempted to observe the Andreev reflection of a beam of ballistic quasiparticle excitations as it impinges on a static B-A phase interface. The beam is created, and the Andreev reflected component measured, by the quasiparticle equivalent of a black-body radiator. The A-phase is stabilized at low temperature and pressure by a magnetic field which is generated by a miniature superconducting solenoid, situated next to the radiator orifice and which provides the necessary 0.34 T field in a small, localized region. Preliminary results indicate that we can observe Andreev reflection both from the high-field distorted B-phase energy gap and from the larger equatorial A-phase energy gap.
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Cousins, D.J., Enrico, M.P., Fisher, S.N. et al. Andreev reflection of a beam of ballistic quasiparticle excitations incident on a static B-A phase interface in superfluid3He. J Low Temp Phys 101, 293–298 (1995). https://doi.org/10.1007/BF00754591
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DOI: https://doi.org/10.1007/BF00754591