Fizika Nizkikh Temperatur: Volume 45, Number 12 (December 2019), p. 1451-1455 ( to contents , go back )
Spin kinetics of liquid 3He in the system aerogel–DyF3 nanoparticles
E.M. Alakshin1, E.I. Kondratyeva1,2, V.V. Kuzmin1, K.R. Safiullin1,2, A.A. Stanislavovas1, G.A. Dolgorukov1, A.V. Klochkov1, and M.S. Tagirov1,2
1Kazan Federal University, Institute of Physics, 18 Kremlyovskaja, Kazan 420008, Russia
2Институт прикладных исследований АН РТ, Казань, 420011, Россия
Received January 14, 2019, revised August 2, 2019, published online October 25, 2019
The spin kinetics of liquid 3He in a sample of oriented Al2O3 aerogel containing DyF3 nanoparticles with an average particle size of 5 nm at temperatures of 1.5–3 K was studied using pulsed NMR method. The DyF3 is a dipole dielectric ferromagnet with a magnetic phase transition temperature of TC = 2.55 K, whereas diamagnetic oriented Al2O3 aerogel is a diluting substance for optimal observation conditions for nuclear magnetic resonance of 3He. Anomalies in the spin kinetics of 3He in contact with this sample associated with the magnetic phase transition were not detected. The method that allows to introduce paramagnetic impurities into aerogel in a controllable way was proposed.
Key words: NMR, 3Не, DyF3, nanoparticles, aerogel, nuclear magnetic relaxation, low temperatures.