Nuclear spin-lattice relaxation via paramagnetic impurities in solids with arbitrary space dimension

A tilted rotatory frame method for the measurement of nuclear spin diffusion coefficients in solids doped with paramagnetic centers: Mn-Doped CaF2

“…Electronic relaxation in Mn-doped CaF 2 at room temperature has been shown to be controlled by acoustical and optical phonons in a Raman process, anda small contribution of an Orbach process [52]. These mechanisms of relaxation are independent of B 0, except insofar as the magnetic field may alter the value of the energy of the excited state in the Orbach process [42]. At this stage, one cannot speculate more on the derivation of T~I from rotatory frame relaxation experiments at variable angles.…”

“…In the absence of spin diffusion, the relaxation by paramagnetic centers bound to a polymeric chain of fractal dimension has been treated by Tabti [27]. The case of an inhomogeneous distribution of paramagnetic centers in a D-dimensional space embedded in a d-dimensional medium has been treated by Furman [42].…”

11B nuclear magnetic resonance study of boron nitride nanotubes prepared by mechano-thermal method

“…In the inhomogeneous case, the sample is regarded as consisting of subsystems, each of which includes a paramagnetic impurity with neighboring nuclei and possesses a local magnetization, packed in a d-dimensional space. Then, the relaxation process of Zeeman order is described as exp½ÿðt=T 1 Þ ðDCdÞ=6 [29,30].…”

Nuclear magnetic relaxation by regularly distributed dense paramagnetic ions in a quasi-two-dimensional system

“…Nuclear spin-lattice relaxation in a randomly diluted magnetic system has long been studied [13,14], and the nuclear spin-lattice relaxation in type-II superconductor was recently analyzed by treating vortices as paramagnetic impurities [15,16]. In a randomly diluted magnetic system, the magnetic ion concentration, which determines the percolation of exchange interaction path, is an important factor in the nuclear spin-lattice relaxation.…”