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Orbitropic Effect in Superfluid 3He B-phase Boundaries.

Manuel Arrayás1, Richard P Haley2, George R Pickett2

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Orbital viscosity affects superfluid 3He-B phase transitions near boundaries. A new model explains interface friction due to quasiparticle redistribution, validated by magnetic field experiments.

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Area of Science:

  • Condensed matter physics
  • Superfluidity in Helium-3

Background:

  • The B phase of superfluid 3He exhibits complex texture and order-parameter dynamics.
  • Understanding boundary effects is crucial for superfluid dynamics.

Purpose of the Study:

  • To investigate the impact of orbital viscosity on the order-parameter and texture evolution in superfluid 3He-B.
  • To develop a model for interfacial friction driven by boundary motion.

Main Methods:

  • Modeling the redistribution of thermal quasiparticles near a moving boundary.
  • Developing a model that assigns effective mass to the interface.
  • Testing the model against experimental data of A-B interface motion controlled by magnetic fields.

Main Results:

  • A novel mechanism for interfacial friction has been identified, arising from quasiparticle redistribution.
  • The developed model successfully explains existing experimental data.
  • The model predicts behavior in scenarios involving texture rearrangement due to boundary motion.

Conclusions:

  • Orbital viscosity plays a significant role in the dynamics of superfluid 3He-B near interfaces.
  • The new friction mechanism provides a better understanding of boundary interactions in superfluids.
  • The model offers predictive power for future experiments involving moving superfluid boundaries.