Spin waves in lithium at 80 GHz

• Published in: Physical review. B, Condensed matter Condensed matter, 1985-06, Vol.31 (11), p.7408-7412
• Main Authors: SAMBLES, J. R, MACE, D. A. H, DUNIFER, G. L
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Materials science; Metals, semimetals and alloys; Other topics in magnetic properties and materials; Physics; Specific materials; Spin waves
• ISSN: 0163-1829; 1095-3795
• DOI: 10.1103/PhysRevB.31.7408

The use of a microwave transmission spectrometer operating at 80 GHz has enabled the first observation of resolved spin waves in Li. Comparison of the experimental data with theoretical line shapes derived from the Landau, Fermi-liquid theory allows a determination of the Landau many-body spin parameters B sub 0 and B sub 1 for a series of effective-mass (m*) values between 2.1-2.5 m sub 0 where m sub 0 is the free-electron mass. By comparing with data on Na, potassium, and Rb it is deduced that the most likely values for these three parameters are m*/m sub 0 = 2.30 plus/minus 0.20, and for a mass ratio of 2.30 that B sub 0 = --0.23 plus /minus 0.03 and B sub 1 = --0.08 plus/minus 0.05. Moreover, the ratio of the Pauli spin susceptibility to that of a free-electron gas is 2.99 plus/minus 0.12 irrespective of m*. All these values compare favorably with other measurements. 21 ref.--AA