NMR研究~ 3 He杂质在超固态~ 4 He中的动力学
NMR study of the dynamics of 3He impurities in the proposed supersolid state of solid 4He
摘要：
通过测量非经典转动惯量（NCRIF）区域的核磁共振弛豫时间T1、T2，研究了3 He原子在固体4 He中的动力学行为.对于3 He浓度x3 = 16 ppm和24 ppm，在对应于NCRIF开始的温度下以及在较低温度下，观察到3 He-4 He相分离的自旋-晶格弛豫时间T1和自旋-自旋弛豫时间T2的变化。T1和T2的幅度在相分离以上的温度大致同意与现有的理论的基础上隧穿的3 He杂质在弹性应变场由于同位素失配。然而，在T1和T2中的一个明显的峰值和一个不太好解决的功能，观察附近的报告NCRIF的起始温度，在隧道理论预测的温度无关的弛豫时间相反。
英文摘要：
The dynamics of 3He atoms in solid 4He have been investigated by measuring the NMR relaxation times T1, T2 in the region where a significant non-classical rotational inertia fraction (NCRIF) has been reported. For 3He concentrations x3 = 16 ppm and 24 ppm, changes are observed for both the spin-lattice relaxation time T1 and the spin-spin relaxation time T2 at the temperatures corresponding to the onset of NCRIF and, at lower temperatures, to the 3He-4He phase separation. The magnitudes of T1 and T2 at temperatures above the phase separation agree roughly with existing theory based on the tunneling of 3He impurities in the elastic strain field due to isotopic mismatch. However, a distinct peak in T1 and a less well-resolved feature in T2 are observed near the reported NCRIF onset temperature, in contrast to the temperature-independent relaxation times predicted by the tunneling theory.
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