@article{oai:oist.repo.nii.ac.jp:00000378,
 author = {Smorodin, A. V. and Rybalko, A. S. and Konstantinov, D.},
 issue = {5-6},
 journal = {Journal of Low Temperature Physics},
 month = {Feb},
 note = {We report experimental study of electrical properties of liquid helium-4 in the temperature range 1.2-3 K. The experiment is carried out in the millimeterwave range using a whispering-gallery-mode dielectric resonator, and the complex permittivity of liquid helium is extracted from the data using the resonant perturbation method. The results for temperature dependence of the dielectric constant are consistent with the previous studies. In addition, we find strong enhancement of the loss tangent around the superfluid transition temperature.},
 pages = {361--368},
 title = {Measurements of the Complex Permittivity of Liquid Helium-4 in the Millimeter Wave Range by a Whispering Gallery Mode Resonator},
 volume = {187},
 year = {2017}
}