Helium in Aerogel

AUG 01, 1996

A minute amount of appropriately placet impurity has fascinating effects on the nature of the superfluid transitions in helium‐4 and helium‐3, and on the ordering of ³He‐⁴He, mixtures.

DOI: 10.1063/1.881509

Moses Chan

Norbert Mulders

John Reppy

An important theme that threads through many areas of current interest in condensed matter physics is the effect of randomness and disorder. Prior to the 1960s, disorder and impurities were often viewed as unavoidable nuisances that masked the true behavior of ideal systems. We have since learned that disorder itself can bring forth fascinating and often unexpected new phenomena in condensed phases of matter. (See the December 1988 special issue of PHYSICS TODAY, dedicated to disordered solids.)

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References

1. For a recent review of the superfluid transition of 4 He in porous media, see J. D. Reppy, J. Low Temp. Phys. 87, 205 (1992).https://doi.org/JLTPAC
2. For the most recent results on aerogel, see R. W. Pekala, L. W. Hrubesh, eds., Proceedings of the Fourth International Symposium on Aerogel, North Holland, Amsterdam (1995)
[J. Non‐Cryst. Solids, 186 (1995)]. https://doi.org/JNCSBJ
For a more informal account, see J. Fricke, Sci. Am., May 1989, p. 92.
3. M. H. W. Chan, K. I. Blum, S. Q. Murphy, G. K.‐S. Wong, J. D. Reppy, Phys. Rev. Lett. 61, 1950 (1988). https://doi.org/PRLTAO
G. K.‐S. Wong, P. A. Crowell, H. A. Cho, J. D. Reppy, Phys. Rev. B 48, 3858 (1993).https://doi.org/PRBMDO
4. N. Mulders, R. Mehrotra, L. S. Goldner, G. Ahlers, Phys. Rev. Lett. 67, 695 (1991).https://doi.org/PRLTAO
5. A. B. Harris, J. Phys. C 7, 1671 (1974). https://doi.org/JPSOAW
J. T. Chayes, L. Chayes, D. S. Fisher, T. Spencer, Phys. Rev. Lett. 57, 2999 (1986).https://doi.org/PRLTAO
6. O. Narayan, D. S. Fisher, Phys. Rev. B 42, 7869 (1990). https://doi.org/PRBMDO
For further references on current theories about the superfluid transition in aerogel, see K. Moon, S. M. Girvin, Phys. Rev. Lett. 75, 1328 (1995).https://doi.org/PRLTAO
7. D. W. Schaefer, C. J. Brinker, D. Richter, B. Fargo, B. Frick, Phys. Rev. Lett. 64, 2316 (1990).https://doi.org/PRLTAO
8. M. Larson, N. Mulders, G. Ahlers, Phys. Rev. Lett. 68, 3896 (1992).https://doi.org/PRLTAO
9. S. B. Kim, J. Ma, M. H. W. Chan, Phys. Rev. Lett. 71, 2268 (1993). https://doi.org/PRLTAO
N. Mulders, M. H. W. Chan, Phys. Rev. Lett. 75, 3705 (1995).https://doi.org/PRLTAO
10. J. P. Romagnan, J. P. Laheurte, J. C. Noiray, W. F. Saam, J. Low Temp. Phys. 70, 425 (1978).https://doi.org/JLTPAC
11. P. A. Crowell, J. D. Reppy, S. Mukheriee, J. Ma, M. H. W. Chan, D. W. Schaefer, Phys. Rev. B 51, 12712 (1995).https://doi.org/PRBMDO
12. L. Pricaupenko, J. Treiner, Phys. Rev. Lett. 74, 430 (1995). https://doi.org/PRLTAO
M. Bonisegni, D. M. Ceperley, Phys. Rev. Lett. 74, 2288 (1995).https://doi.org/PRLTAO
13. A. Maritan, M. Cieplak, M. Swift, F. Toigo, J. R. Banavar, Phys. Rev. Lett. 69, 221 (1992).https://doi.org/PRLTAO
14. A. Falicov, A. N. Berker, Phys. Rev. Lett. 74, 426 (1995).https://doi.org/PRLTAO
15. J. V. Porto, J. M. Parpia, Phys. Rev. Lett. 74, 4667 (1995).https://doi.org/PRLTAO
16. D. T. Sprague, T. M. Haard, J. B. Kycia, M. R. Rand, Y. Lee, P. J. Hamot, W. P. Halperin, Phys. Rev. Lett. 75, 661 (1995).https://doi.org/PRLTAO
17. G. Ahlers, Rev. Mod. Phys. 52, 489 (1980).https://doi.org/RMPHAT
18. J. Lipa, D. R. Swanson, J. Nissen, T. C. P. Chui, U. E. Israelson, Phys. Rev. Lett. 76, 944 (1996), and references therein.https://doi.org/PRLTAO

More about the Authors

Moses Chan. Pennsylvania State University, University Park.

Norbert Mulders. Pennsylvania State University, University Park.

John Reppy. Cornell University, Ithaca, New York.