Measurement of the Electron Spin Susceptibility in Copper and Lithium Using a New Application of Conduction Electron Spin Resonance in Bilayers.
Abstract
Conduction electron spin resonance, (CESR), in metal bilayers is used as a new technique to measure the electron spin susceptibilities of copper and lithium. Experiments have verified this new technique which potentially expands the number of elements for which spin susceptibilities can be measured to include all elements in which CESR can be observed. A consequence of many body interactions in metals is the enhancement of the electron spin susceptibility from its free electron value, (chi) = (zeta) (chi)(,Pauli), where (chi)(,Pauli) is the free electron spin susceptibility. This susceptibility enhancement is a property of metals for which the effects of electron-electron interactions can be calculated. A measure of this enhancement factor can thus provide a test of theoretical calculations of (zeta). The CESR resonant frequency, (omega)(,0), of a metal bilayer in which motional narrowing of the constituent Larmor precession frequencies can be achieved is shown to have a particularly simple dependence on the ratio of the electron spin susceptibilities of the two metals. The task of measuring the weak and thus difficult to measure electron spin susceptibility is now reduced to one of measuring the position of a CESR line. Using sodium and potassium as susceptibility standards, (zeta)'s of lithium and copper are found to be 2.87 (+OR -) .29 and 1.35 (+OR-) .12 respectively. The data presented for lithium are in agreement with previous measurements while the copper data provide the first direct measure of its spin susceptibility. The results are compared with other experiments and theoretical predictions.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- August 1981
- Bibcode:
- 1981PhDT........11T
- Keywords:
-
- Physics: Condensed Matter;
- Copper;
- Electron Paramagnetic Resonance;
- Electron Spin;
- Lithium;
- Conduction Electrons;
- Free Electrons;
- Larmor Precession;
- Solid-State Physics