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Use of Nuclear Spin Noise Spectroscopy to Monitor Slow Magnetization Buildup at Millikelvin Temperatures
Author(s) -
Pöschko Maria Theresia,
Peat David,
OwersBradley John,
Müller Norbert
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600323
Subject(s) - excitation , spectroscopy , relaxation (psychology) , nuclear magnetic resonance , spin–lattice relaxation , condensed matter physics , saturation (graph theory) , spin polarization , chemistry , hyperfine structure , magnetization , atomic physics , materials science , molecular physics , magnetic field , paramagnetism , physics , nuclear physics , mathematics , quantum mechanics , combinatorics , electron , psychology , social psychology
At ultralow temperatures, longitudinal nuclear magnetic relaxation times become exceedingly long and spectral lines are very broad. These facts pose particular challenges for the measurement of NMR spectra and spin relaxation phenomena. Nuclear spin noise spectroscopy is used to monitor proton spin polarization buildup to thermal equilibrium of a mixture of glycerol, water, and copper oxide nanoparticles at 17.5 mK in a static magnetic field of 2.5 T. Relaxation times determined in such a way are essentially free from perturbations caused by excitation radiofrequency pulses, radiation damping, and insufficient excitation bandwidth. The experimental spin‐lattice relaxation times determined on resonance by saturation recovery with spin noise detection are consistently longer than those determined by using pulse excitation. These longer values are in better accordance with the expected field dependence trend than those obtained by on‐resonance experiments with pulsed excitation.