Pressure-Dependence of the Nuclear Quadrupole Coupling Constant and the Knight Shift of Single-Crystal Gallium.
Abstract
The nuclear quadrupole coupling tensor at temperatures of 273 K, 198 K, and 77 K, and the Knight shift tensor at a temperature of 77 K of gallium metal were measured as a function of hydrostatic pressure up to 7 Kbars, by employing nuclear quadrupole and nuclear magnetic resonance techniques. Single crystal samples were used to determine the electric field gradient asymmetry parameter and all the components of the Knight shift tensor. Hydrostatic pressure at low temperature was achieved by using a helium gas pressure system. The volume dependence of the isotropic Knight shift was found to be V sup 4.95. The pressure dependence of the Knight shift and that of the spin-lattice relaxation time of gallium conforms to the Korringa relation. The thermal expansion contribution and the explicit temperature dependence of the electric field gradient and the Knight shift were also separated by using published temperature dependent data.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1977
- Bibcode:
- 1977PhDT........40H
- Keywords:
-
- Physics: Condensed Matter;
- Constants;
- Coupling;
- Gallium;
- Nuclear Magnetic Resonance;
- Pressure Gradients;
- Quadrupoles;
- Single Crystals;
- Hydrostatic Pressure;
- Isotropic Media;
- Nuclear Quadrupole Resonance;
- Solid-State Physics