Spin Transport in Very Dilute 3He-4He at Very High B/T

Springer Science and Business Media LLC - 2002
H. Akimoto1,2, J. S. Xia1, E. D. Adams1, D. Candela2, W. J. Mullin2, N. S. Sullivan1
1Microkelvin Laboratory, NHMFL and Physics Department, University of Florida, Gainesville, USA
2Hasbrouck Laboratory, Department of Physics, University of Massachusetts, Amherst, USA

Tóm tắt

We report preliminary results for pulsed-NMR measurements on a very dilute 3 He- 4 He mixture (x 3 =900 ppm) in a 14.74 T field at temperatures down to 3 mK. The aim of the project is to investigate low temperature transverse spin relaxation and possible spin diffusion anisotropy. Spin-echo and T1-type measurements were employed to measure the transverse and longitudinal spin diffusion coefficients. At high temperatures both spin diffusion coefficients are well explained assuming a quasiparticle interaction consistent with previous experiments. Conversely, at low temperatures the measured value of |λωτ⊥| is apparently limited to about ten by a poorly-understood process that accelerates spin-echo decay. This hampers an accurate determination of the transverse diffusion coefficient at the lowest temperatures reached.

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Tài liệu tham khảo

A. E. Meyerovich, Phys. Lett. 107A, 177 (1985); A. E. Meyerovich and K. A. Musaelian, J. Low Temp. Phys. 95, 789 (1994), and references therein.

J. W. Jeon and W. J. Mullin, J. Phys. (Paris), 49, 1691 (1988); W. J. Mullin and J. W. Jeon, J. Low Temp. Phys., 88, 433 (1992).

I. A. Fomin, JETP Letters, 65, 749 (1997).

J. H. Ager et al., J. Low Temp. Phys. 99, 683 (1995).

J. R. Owers-Bradley et al., J. Low Temp. Phys. 121, 779 (2000)

L.-J. Wei, N. Kalechofsky, and D. Candela, Phys. Rev. Lett., 71, 879 (1993).

D. Candela, H. Akimoto, R. M. Bowley, O. Buu, D. Clubb and J. R. Owers-Bradley, J. Low Temp. Phys. 121, 767 (2000)

G. Vermeulen and A. Roni, Phys. Rev. Lett., 86, 248 (2000).

C. Lhuillier and F. Laloë, J.Phys. 43 197, (1982); 43 225, (1982).

A. J. Leggett, J. Phys. C3 448, (1970).

H. Akimoto, and D. Candela, J. Low Temp. Phys. 121, 791 (2000).

H. Akimoto et al., Physica B, 284–288, 313 (2000).

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