Continuous wave (CW) nuclear magnetic resonance measurements have been made at 5.5 MHz of 3He adsorbed on Grafoil and on argon (monolayer)-coated Grafoil at coverages 0.55 ⩽ x ⩽ 1.35 (x = 1 corresponds to one monolayer), in the temperature range 0.35–4.21 K. The results indicate that the near-monolayer coverages (0.9 ⩽ x ⩽ 1.0) behave as 2D solids with dipole-dipole coupling modulated by quantum exchange between nearest neighbors. The exchange frequency for this solid phase is evaluated and is seen to be comparable to that observed in bulk, solid 3He for similar atomic spacing. The intermediate coverages, 0.55 ⩽ x ⩽ 0.80, showed no evidence of line broadening in the entire temperature range investigated, while the relative magnetic susceptibilities indicated no deviation from Curie's law. No evidence for the registered phase was found at x = 0.60 either for 3He on Grafoil or for 3He on argon-coated Grafoil. A sharp decrease was observed in linewidth after completion of the monolayer, making NMR an excellent probe for the determination of monolayer completion. We have also made linewidth measurements for a coverage x = 0.95 of 3He on graphitized carbon black (Sterling FT grade) at 4.2 and 1.2 K. The results are consistent, as in the case of 3He on Grafoil, with a 2D solid with significant quantum tunneling between nearest neighbors. This result, however, is in disagreement with the measurements of Rollefson, also for 3He on graphitized carbon black of the same grade, who observed a rigid lattice behavior with negligible tunneling between neighbors, for a coverage x = 0.90. This discrepancy is not yet understood.
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References
J. G. Daunt and E. Lerner, Eds., Monolayer and Submonolayer Helium Films (Plenum Press, New York, 1973).
J. G. Dash, Films on Solid Surfaces (Academic Press, New York, 1975).
M. Bretz, J. G. Dash, D. C. Hickernell, et al., Phys. Rev. A 8, 1589 (1973).
S. V. Hering and O. E. Vilches, in Ref. 1, p. 5.
S. G. Hegde and J. G. Daunt, J. Low Temp. Phys. 32, 765 (1978).
M. Bretz and J. G. Dash, Phys. Rev. Lett. 26, 963 (1971).
G. Ahlers, Phys. Rev. A 2, 1505 (1970).
P. Monod and J. A. Cowen, preprint (unpublished).
D. F. Brewer, D. J. Creswell, et al., in Ref. 1, p. 101.
D. J. Creswell, D. F. Brewer, and A. L. Thompson, Phys. Rev. Lett. 29, 1144 (1972).
N. S. Sullivan, J. Low Temp. Phys. 22, 313 (1976).
D. P. Grimmer and K. Lusczynski, J. Low Temp. Phys. 26, 19 (1977).
D. C. Hickernell, D. L. Husa, and J. G. Daunt, Phys. Lett. 49A, 435 (1974).
B. P. Cowan, Ph.D. Thesis, University of Sussex, England (1977); B. P. Cowan, M. G. Richards, A. L. Thomson, and W. J. Mullin, Phys. Rev. Lett. 38, 165 (1977).
S. G. Hegde, E. Lerner, and J. G. Daunt, Phys. Lett. 49A, 437 (1974).
S. G. Hegde and J. G. Daunt, Bull. Am. Phys. Soc. 19, 511 (1974).
W. J. Mullin, D. J. Creswell, and B. Cowan, J. Low Temp. Phys. 25, 245 (1976).
C. P. PooleJr., and H. A. Farach, Relaxation in Magnetic Resonance (Academic Press, New York, 1971), p. 11.
J. Owers-Bradley, B. P. Cowan, and M. G. Richards, Workshop on Physical Adsorption, Brookhaven National Laboratories (December 1976), unpublished; and private communication.
M. G. Richards, in Advances in Magnetic Resonance, Vol. 5 (Academic press, New York, 1975), p. 306.
R. A. Guyer and L. I. Zane, Rev. Mod. Phys. 43, 532 (1971).
R. J. Rollefson, Phys. Rev. Lett. 29, 410 (1972).
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Hegde, S.G., Daunt, J.G. Nuclear magnetic resonance of adsorbed 3He films on Grafoil and argon-coated grafoil. II. Intermediate and near-monolayer coverages. J Low Temp Phys 34, 233–253 (1979). https://doi.org/10.1007/BF00117152
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DOI: https://doi.org/10.1007/BF00117152