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Title: Resonance absorption of microwaves in He II: Evidence for roton emission

Abstract

Microwave (MW) absorption in liquid {sup 4}He is investigated in the frequency range of 40-200 GHz at T=1.4-2.5 K. A 'whispering gallery' of waves was generated by a dielectric disk resonator immersed into the liquid. Resonance absorption of MWs was detected at the frequency, which corresponds to the roton minimum of the liquid helium excitation spectrum. The creation of a single roton is possible because of the presence of the resonator wall which absorbs an extra momentum. The resonance frequency is shown to decrease with temperature in an excellent agreement with the temperature dependence of the roton gap obtained previously in the neutron scattering experiment.

Authors:
; ; ;  [1]; ; ;  [2]
  1. B.I.Verkin Institute for Low Temperature Physics and Engineering, NAS of Ukraine, 47, Lenin Avenue, Kharkov, 61103 (Ukraine)
  2. Institute of Radiophysics and Electronics, NAS of Ukraine, 12 Proskury Strasse, 61085 Kharkov (Ukraine)
Publication Date:
OSTI Identifier:
21052707
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 76; Journal Issue: 14; Other Information: DOI: 10.1103/PhysRevB.76.140503; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; EMISSION; EXCITATION; GHZ RANGE; HELIUM; HELIUM 4; LIQUIDS; MICROWAVE RADIATION; NEUTRON DIFFRACTION; RESONANCE; RESONANCE ABSORPTION; RESONATORS; ROTONS; SPECTRA; SUPERFLUIDITY; TEMPERATURE DEPENDENCE

Citation Formats

Rybalko, A, Rubets, S, Rudavskii, E, Tikhiy, V, Tarapov, S, Golovashchenko, R, and Derkach, V. Resonance absorption of microwaves in He II: Evidence for roton emission. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.76.140503.
Rybalko, A, Rubets, S, Rudavskii, E, Tikhiy, V, Tarapov, S, Golovashchenko, R, & Derkach, V. Resonance absorption of microwaves in He II: Evidence for roton emission. United States. https://doi.org/10.1103/PHYSREVB.76.140503
Rybalko, A, Rubets, S, Rudavskii, E, Tikhiy, V, Tarapov, S, Golovashchenko, R, and Derkach, V. 2007. "Resonance absorption of microwaves in He II: Evidence for roton emission". United States. https://doi.org/10.1103/PHYSREVB.76.140503.
@article{osti_21052707,
title = {Resonance absorption of microwaves in He II: Evidence for roton emission},
author = {Rybalko, A and Rubets, S and Rudavskii, E and Tikhiy, V and Tarapov, S and Golovashchenko, R and Derkach, V},
abstractNote = {Microwave (MW) absorption in liquid {sup 4}He is investigated in the frequency range of 40-200 GHz at T=1.4-2.5 K. A 'whispering gallery' of waves was generated by a dielectric disk resonator immersed into the liquid. Resonance absorption of MWs was detected at the frequency, which corresponds to the roton minimum of the liquid helium excitation spectrum. The creation of a single roton is possible because of the presence of the resonator wall which absorbs an extra momentum. The resonance frequency is shown to decrease with temperature in an excellent agreement with the temperature dependence of the roton gap obtained previously in the neutron scattering experiment.},
doi = {10.1103/PHYSREVB.76.140503},
url = {https://www.osti.gov/biblio/21052707}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 14,
volume = 76,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2007},
month = {Mon Oct 01 00:00:00 EDT 2007}
}