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Preliminary Measurements of Andreev Reflection of Quasiparticles by Turbulence in Superfluid 3He

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Abstract

We present preliminary measurements of Andreev scattering of quasiparticles from turbulence in the B-phase of superfluid 3He-B. The turbulence is generated by a vibrating wire resonator driven above its pair-breaking critical velocity. The vortices intercept a beam of quasiparticles generated by a nearby black-body radiator. A substantial fraction of the incident quasiparticles are retro-reflected back into the radiator by Andreev scattering processes. The resulting temperature rise within the radiator provides a direct measurement of the flux of quasiparticles Andreev reflected. The technique provides a sensitive probe of superfluid turbulence in the ultra-low temperature regime.

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Authors and Affiliations

  1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K

    D. I. Bradley, S. N. Fisher, A. M. Guénault, M. Lowe, G. R. Pickett & A. Rahm

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  1. D. I. Bradley
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  2. S. N. Fisher
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  3. A. M. Guénault
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  4. M. Lowe
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  5. G. R. Pickett
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  6. A. Rahm
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Bradley, D.I., Fisher, S.N., Guénault, A.M. et al. Preliminary Measurements of Andreev Reflection of Quasiparticles by Turbulence in Superfluid 3He. Journal of Low Temperature Physics 124, 113–122 (2001). https://doi.org/10.1023/A:1017569716880

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