Pressure dependence of the rare earth Knight shift in the singlet ground state systems PrP and TmP
Abstract
The pressure dependence of the Knight shift (K) was measured for Pr-141 in PrP and Tm-169 in TmP at 4 K and find d ln K/dP = 0.83% and 0.48%/kbar, respectively. Both compounds are paramagnetic but exhibit a temperature independent susceptibility near T = 0 due to crystal field induced singlet electronic ground state. The rare earth Knight shift provides a direct measurement of the susceptibility, from which the crystal field splitting may be determined. Thus, the result of d ln K/dP 0 is in qualitative disagreement with the usually successful effective point charge model. Such a model implies that field splitting varies as some inverse power of the lattice constant and, consequently, that the pressure derivative d ln K/dP) is negative. Anomalous conduction electron nuclear coupling effects were checked by measuring the pressure dependence of the P-31 Knight shift in PrP.
- Publication:
-
Presented at 20th Ann. Conf. on Magnetism and Magnetic Materials
- Pub Date:
- 1974
- Bibcode:
- 1974mmm..conf.....W
- Keywords:
-
- Magnetic Permeability;
- Pressure Effects;
- Rare Earth Compounds;
- Crystal Structure;
- Electron States;
- Magnetic Properties;
- Phosphorus Compounds;
- Praseodymium;
- Thulium;
- Solid-State Physics