| Issue |
J. Phys. Colloques
Volume 41, Number C8, Août 1980
Fourth International Conference on Liquid and Amorphous Metals
|
|
|---|---|---|
| Page(s) | C8-403 - C8-407 | |
| DOI | https://doi.org/10.1051/jphyscol:1980899 | |
J. Phys. Colloques 41 (1980) C8-403-C8-407
DOI: 10.1051/jphyscol:1980899
THEORY OF TEMPERATURE DEPENDENCE OF KNIGHT SHIFTS AND SPIN-LATTICE RELAXATION TIMES IN LIQUID LITHIUM AND SODIUM
P. Heitjans1, A. Coker2, T. Lee2 et T.P. Das21 Fachbereich Physik, Universität Marburg, R.F.A. and Institut Laue-Langevin, Grenoble, France
2 Department of Physics, State University of New-York, Albany, N.Y. 12222, U.S.A.
Abstract
Using a first-order pseudopotential perturbation procedure we have investigated the Knight shifts K and spin-lattice relaxation times T1 in liquid lithium and sodium both for their values at the melting points and the temperature dependences. The analysis uses temperature-dependent structure factors obtained from neutron - diffraction data. Our results for K and T1 at the melting point agree well with available data for both metals, the T1 data for lithium referring to 8Li nucleus being taken from polarized-neutron capture beta-decay technique and the other data from nuclear magnetic resonance measurements. For the temperature dependences, our calculations give positive slopes for K and (T1T)-1, a trend in agreement with experiment. However, while the slopes in sodium are in reasonable agreement with experiment with respect to magnitudes, they are substantially over-estimated for lithium. Arguments are presented for second-order effects of the pseudopotential in lithium as being the likely source for this difference between theory and experiment.