Fractional power time dependence of the nuclear magnetization in the presence of paramagnetic impurities.
We extend the theory of growth of the nuclear magnetization in the presence of paramagnetic impurities and the absence of spin diffusion to the case of multi-paramagnetic centers. We show that for short times after saturation pulses, the rate of growth of the magnetization is proportional to t alpha where t is the time and alpha = 1/3, 1/2 and 2/3 for one-, two- and three-dimensional systems, respectively. We also present experimental data for which the total time-dependent magnetization is proportional to exp[-(t/T1) alpha], which reduces to the above time dependence for short times.
Furman
G B
GB
Department of Physics, Ben-Gurion University, Be'er Sheva, Israel.
Kunoff
E M
EM
Goren
S D
SD
Pasquier
V
V
Tinet
D
D
D004578:Electron Spin Resonance Spectroscopy; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008432:Mathematical Computing; D013997:Time Factors; D017968:Vanadium Compounds / Q000737:chemistry
D017968:Vanadium Compounds; C066075:vanadium pentoxide