title: Fractional power time dependence of the nuclear magnetization in the presence of paramagnetic impurities.
abstract: 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.
authors.affiliation: Department of Physics, Ben-Gurion University, Be'er Sheva, Israel.
authors.forename: G B
authors.initials: GB
authors.lastname: Furman
authors.forename: E M
authors.initials: EM
authors.lastname: Kunoff
authors.forename: S D
authors.initials: SD
authors.lastname: Goren
authors.forename: V
authors.initials: V
authors.lastname: Pasquier
authors.forename: D
authors.initials: D
authors.lastname: Tinet
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008432:Mathematical Computing; D013997:Time Factors; D017968:Vanadium Compounds / Q000737:chemistry
chemical_list: D017968:Vanadium Compounds; C066075:vanadium pentoxide