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Pulsed Nuclear Magnetic Resonance on 3He Adsorbed on Bare and 4He Preplated MCM-41 Using DC SQUID Detection

Abstract

We report low field DC SQUID NMR measurements down to 1.5 K of 3He adsorbed in the pores of the mesoporous molecular sieve MCM-41. In the first experiment measurements were made on 3He adsorbed onto the bare pore walls of MCM-41 with coverages ranging from \(n_{^{3}\mathrm{He}}=0.86n_{1}\) to full pores at \(n_{^{3}\mathrm{He}}=1.79n_{1}\) , where n 1 is the coverage for monolayer completion. A second experiment was performed with low 3He coverages ( \(n_{^{3}\mathrm{He}}\sim0.01n_{1}\) ) on 4He preplated pores, where a crossover to a quasi-1D state is expected to occur at temperatures sufficiently below 700 mK.

In both experiments relaxation times T 1 and T *2 were measured as a function of temperature and coverage at frequencies from 80 to 240 kHz. The frequency dependence of the linewidth in the pure 3He experiment is extremely weak therefore T *2 T 2. The 1.5 K isotherm shows a small minimum in T *2 at a coverage corresponding to monolayer completion. In the experiment with 4He preplating there was no significant change in T 1 or T *2 when the 3He coverage was doubled from \(n_{^{3}\mathrm{He}}=0.01n_{1}\) to 0.02n 1 at a 4He preplating of \(n_{^{4}\mathrm{He}}=1.05n_{1}\) . This suggests that the relaxation times are dominated by single particle effects in the low density regime.

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Correspondence to B. Yager.

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This work is partially supported by the Engineering and Physical Sciences Research Council.

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Yager, B., Nyéki, J., Casey, A. et al. Pulsed Nuclear Magnetic Resonance on 3He Adsorbed on Bare and 4He Preplated MCM-41 Using DC SQUID Detection. J Low Temp Phys 158, 213 (2010). https://doi.org/10.1007/s10909-009-0005-x

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Keywords

  • SQUID
  • NMR
  • 3He
  • 1D
  • Zeolite

PACS

  • 67.30.er
  • 67.30.ht
  • 67.60.gj