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Spin diffusion and nuclear spin-lattice relaxation in irradiated solids: a multiple-pulse NQR study
G B Furman1, S D Goren, A M Panich
1Department of Physics, Ben-Gurion University, Beersheba, Israel.
This study investigates spin-lattice relaxation and spin diffusion in solids with paramagnetic impurities using Nuclear Quadrupole Resonance (NQR). Researchers determined the spin diffusion coefficient and diffusion barrier radius in gamma-irradiated NaClO3.
Area of Science:
- Solid-state physics
- Materials science
- Nuclear magnetic resonance spectroscopy
Background:
- Paramagnetic impurities significantly influence spin dynamics in solids.
- Understanding relaxation and diffusion is crucial for characterizing solid materials.
Purpose of the Study:
- To theoretically and experimentally investigate spin-lattice relaxation and spin diffusion in solids containing paramagnetic impurities.
- To determine the spin diffusion coefficient and diffusion barrier radius in gamma-irradiated NaClO3.
Main Methods:
- Utilized Nuclear Quadrupole Resonance (NQR) multiple-pulse spin-locking techniques.
- Analyzed experimental data based on theoretical models of relaxation and spin diffusion.
Main Results:
- Identified two distinct relaxation regimes: an initial power-law decay followed by exponential decay.
- Established a relationship between relaxation function, spin-lattice relaxation time in the rotating frame (T1rho), and sample dimensionality (d).
- Quantified the spin diffusion coefficient and estimated the diffusion barrier radius in gamma-irradiated NaClO3.
Conclusions:
- The study elucidates the interplay between paramagnetic impurities, spin-lattice relaxation, and spin diffusion in solids.
- The determined parameters provide insights into spin transport mechanisms and material properties.
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