title: Proton spin diffusion in a nanodiamond.
abstract: We report on a proton magnetic resonance study of a powder nanodiamond sample. We show that (1)H spin-lattice relaxation in this compound is mainly driven by the interaction of nuclear spins with unpaired electron spins of paramagnetic defects. We measured the spin-lattice relaxation time T1 by means of a saturation comb pulse sequence followed by dipolar dephasing, and plotted T1 as a function of the dephasing time [Formula: see text] in different external magnetic fields. The received T1([Formula: see text]) dependence provides a striking manifestation of the spin diffusion-assisted relaxation regime. The obtained experimental data allow us to estimate the spin diffusion coefficient and spin diffusion barrier radius.
authors.affiliation: Department of Physics, Ben-Gurion University of the Negev, PO Box 653, Be'er Sheva 8410501, Israel.
authors.forename: A M
authors.initials: AM
authors.lastname: Panich