Spin waves in /sup 3/He-/sup 4/He solutions

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.6422· OSTI ID:6764042

Ishimoto, H; Fukuyama, H; Fukuda, T; Tazaki, T; Ogawa, S

Standing spin-wave modes in /sup 3/He-/sup 4/He dilute solutions with /sup 3/He atomic concentrations between 1.3% and 8.6%, and at pressures of 0, 7, or 8 bars have been studied with cw NMR at Larmor frequencies of 1 and 2 MHz. The spin waves, which produce peaks in the NMR absorption lines, are visible at temperatures below a few millikelvins. At the lowest temperatures, an additional field gradient along the static field causes a new side peak at the outermost frequency. These spin-wave peaks shift with the field gradient. The field-gradient dependence of the spin-wave peaks is fitted to the theory of Leggett, leading to the determination of the Fermi-liquid interaction parameter (lambda). The sign of lambda is found to change at /sup 3/He atomic concentration between 3% and 5% at pressures of both 0 and 7 bars. Its concentration and pressure dependence are discussed on the basis of the quasiparticle interaction potential.

• Research Organization: Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
• OSTI ID: 6764042
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISPERSIONS
ELEMENTS
EVEN-EVEN NUCLEI
FERMI GAS
FLUIDS
GASES
HELIUM
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIZATION
MIXTURES
NMR SPECTRA
NONMETALS
NUCLEI
PRESSURE DEPENDENCE
QUANTUM FLUIDS
QUASI PARTICLES
RARE GASES
SOLUTIONS
SPECTRA
SPIN WAVES
STABLE ISOTOPES