Low Temperature Physics: 32, 857 (2006); https://doi.org/10.1063/1.2356842 (6 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 8-9 (August 2006), p. 1129-1135 ( to contents , go back )
Giant parametric amplification of the nonlinear response in a single crystal of beryllium in a quantizing magnetic field
M.I. Tsindlekht1,2, N. Logoboy1,2, V.S. Egorov1,3, R.B.G. Kramer1, A.G.M. Jansen4, and W. Joss1
1Grenoble High Magnetic Field Laboratory, Max-Plank-Institute für Festkörperforschung, B.P. 166X, Cedex 9, Grenoble F-38042, France
2The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
3Russian Research Center Kurchatov Institute, Moscow, 123182, Russia
4Service de Physique Statistique, Magnetisme et Supraconductivity, DRFMC, CEA, 17 rue de Martyrs, Cedex 9, Grenoble, F-38054, France
Received March 3, 2006
The nonlinear response to an ac magnetic field with and without parametric pumping was studied
experimentally on a rod-like beryllium single crystal at low temperatures in a quantizing magnetic field applied parallel to the hexagonal axis. At low temperatures (≤ 3 K) giant parametric
amplification of the nonlinear response is observed in narrow windows near de Haas– van Alphen
(dHvA) beating antinodes where the amplitude of the magnetic oscillations is maximal. This effect
is of threshold character with respect to the amplitude of the dHvA oscillations and occurs as a result
of a diamagnetic phase transition of a strongly correlated electron gas into nonuniform state with formation of Condon domain structure. It is shown that the nonuniform phase appears periodically in a magnetic field. The components of rectified signal field reproduce the envelope of H–T critical curves and can be used for reconstruction of diamagnetic phase diagrams.
Key words: de Haas—van Alphen effect, Condon domains, paramrtric phenomena.