Nuclear Spin Relaxometry of \(^3\)He Atoms Confined in Mesoporous MCM-41
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MCM-41 is a unique mesoporous material with cylindrical-like pores that provide an ideal platform to study 1D properties of adsorbed atoms (Boninsegni and Moroni in J Low Temp Phys 118(1):1, 2000). In this research, we use pulsed NMR to measure the nuclear spin-lattice relaxation times (\(T_1\)) of \(^3\)He adsorbed onto \(^4\)He-preplated MCM-41 over a wide range of temperatures for a line density that would lead to a Fermi temperature of 200 mK. The temperature dependence of the nuclear spin-lattice relaxation time for \( 0.025<T< 3.5 \) K exhibited a pronounced peak at 195 mK, qualitatively similar to that calculated for the spin relaxation of 1D Fermi systems.
KeywordsLuttinger liquid Helium three NMR
This research was carried out at the National High Magnetic Field Laboratory’s High B/T Facility which is supported by NSF Grant DMR 1644779 and by the State of Florida. This project was also supported in part by an award from the Collaborative Users Grant Program of the NHMFL. We also acknowledge useful discussions with Dmitrii Maslov.