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Experiments on a High Quality Grid Oscillating in Superfluid 4He at Very Low Temperatures

  • V. B. Efimov
  • Deepak Garg
  • M. Giltrow
  • P. V. E. McClintock
  • L. Skrbek
  • W. F. Vinen
Article

Abstract

We have investigated a copper-mesh grid oscillating at its fundamental (0, 1) Bessel mode in superfluid 4He for temperatures 10<T<1500 mK at a pressure of P=5 bar. The high quality factor (Q∼105) of the oscillator allowed us to observe new features of its response to a periodic drive which, at the lowest T, was found to depend on the prehistory of the helium. The experiments have confirmed the existence of two critical velocities, and we discuss whether these critical velocities are associated with quantized vortices.

Keywords

Quantum fluid Quantum turbulence Vibrating grid Superfluid helium 

PACS

67.25.dk 67.25.dg 47.27.Cn 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • V. B. Efimov
    • 1
    • 2
  • Deepak Garg
    • 2
  • M. Giltrow
    • 2
  • P. V. E. McClintock
    • 2
  • L. Skrbek
    • 3
  • W. F. Vinen
    • 4
  1. 1.Institute of Solid State Physics RASChernogolovka, Moscow distr.Russia
  2. 2.Physics DepartmentLancaster UniversityLancasterUK
  3. 3.Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic
  4. 4.School of Physics and AstronomyUniversity of BirminghamBirminghamUK

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