Nuclear magnetic resonance on oriented rare-earth nuclei in rare-earth hosts: Application to 160Tb.
We summarize the application of nuclear magnetic resonance of oriented nuclei to rare-earth impurities implanted in ferromagnetic crystals of heavy rare-earth hosts. The experimental aspects are treated in some detail; we present results obtained on $^{160}\mathrm{Tb}$$\mathrm{Tb}$, and give a formal description of the experiments. A discussion of extension to other, similar systems with applications in nuclear, solid-state, and low-temperature physics is given.
Low temperature nuclear orientation observations of severe neutron activation damage in (160Tb)TbNiAl4
An unusually large attenuation (approximately 50%) in the low temperature nuclear orientation directional gamma anisotropy from unannealed thermal neutron irradiated single crystal (160Tb)TbNiAl4 has been observed in the region of saturation of the second order nuclear orientation coefficient, B2. It is suggested that the form of the remanent neutron activation recoil damage in unannealed (160Tb)TbNiAl4 is fundamentally electric quadrupolar in origin, as opposed to magnetic dipolar.
The electric field gradient at 175Hf nuclei aligned in a Lu single crystal at low temperatures
The quadrupole frequency e2qQ/h for 175Hf in a Lu single crystal has been determined by nuclear orientation at temperatures down to 4 mK as +307-90+50 MHz. With the known groundstate quadrupole moment of Q=+2.7(4) barn for 175Hf the electric field gradient of HfLu is deduced to be eq=+(4.7-1.5+1.0)*1017 V cm-2. The magnitude and the sign fit well into the frame of a recently proposed correlation of electric field gradients in hexagonal transition metals.