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Collisionless spin waves in normal and superfluid 3 | He

Standing spin-wave modes in liquid3 He have been studied by cw NMR at Larmor frequencies of 1, 2, and 4 MHz and pressures of 0, 6.3, and 12.3 bar. The spin waves, which produce peaks in the NMR line, are visible at temperatures below 5 mK at zero pressure. With the assumption of a slightly simplifie... Full description

Main Author: Candela, D.
Contributors: Masuhara, N. | Author
Sherrill, S. | Author
Edwards, O. | Author
Contained in: Journal of Low Temperature Physics Dordrecht : Springer Science + Business Media B.V Vol. 63, No. 5/6 (1986), p. 369-399
Journal Title: Journal of Low Temperature Physics
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Links: Volltext (dx.doi.org)
ISSN: 1573-7357
Additional Keywords: OriginalPaper
DOI: 10.1007/BF00681488
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/BF00681488
BF00681488
PPN (Catalogue-ID): SPR03089848X
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245 1 0 |a Collisionless spin waves in normal and superfluid 3 | He  |h Elektronische Ressource 
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520 |a Standing spin-wave modes in liquid3 He have been studied by cw NMR at Larmor frequencies of 1, 2, and 4 MHz and pressures of 0, 6.3, and 12.3 bar. The spin waves, which produce peaks in the NMR line, are visible at temperatures below 5 mK at zero pressure. With the assumption of a slightly simplified sample shape and no transverse spin relaxation at the walls, the theory of Leggett fits the spin-wave frequencies in the normal liquid very well, giving a value of the Fermi liquid parameter F1 a=−0.6±0.2 at zero pressure. The width of some of the peaks is larger than expected from other determinations of the quasiparticle diffusion time τ D. This could be due to wall relaxation or to deviations from the assumed sample geometry. In the superfluid A1 and A phases, where the data cannot be fitted to existing theories, the spin-wave modes are shifted in frequency and suffer additional damping as the temperature is decreased. At still lower temperatures in the B phase an inversion of the spin-wave spectrum from one side of the NMR line to the other is observed, agreeing quantitatively with the predictions of the 1975 theory of Combescot. 
653 |a OriginalPaper 
700 1 |a Masuhara, N.  |e verfasserin  |4 aut 
700 1 |a Sherrill, S.  |e verfasserin  |4 aut 
700 1 |a Edwards, O.  |e verfasserin  |4 aut 
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