Low temperature magnetization of3He films

P. Schiffer, M. T. O'Keefe, D. D. Osheroff, Hiroshi Fukuyama

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35 Scopus citations


We have made NMR studies of thin films of pure3He adsorbed on Graf oil. Such films were cooled to ∼ 75 μK, an order of magnitude colder than previous workers could attain. In particular, we measured the magnetization of the solid second atomic layer, (M2), which displays antiferromagnetic (AFM) behavior at low densities and ferromagnetic (FM) behavior at high densities. At both AFM and FM densities, we could measure M2 at temperatures well below the exchange energy (J). Our data at the AFM densities may support a proposed model of that phase. At the FM densities, we have found that M2 (T = 0) is linear in second layer density (p2) and rises by a factor of ∼7 with a 6% increase in ρ{variant}2 and less than a factor of 2 increase in the apparent value of J, suggesting that the FM phase coexists with a lower density AFM phase. Our high temperature (T >J) data also support such a two phase model. We find that M2 follows the expected behavior for a 2 dimensional Heisenberg ferromagnet down to T ≪ J, the first experimental observation of such behavior. We also confirmed the importance of k = 0 spin waves in determining the low temperature behavior of such a system. The NMR lineshape in the FM phase also displayed shifts and broadening due to demagnetization effects which support the model of two phase coexistence.

Original languageEnglish (US)
Pages (from-to)489-513
Number of pages25
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Mar 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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