Abstract
We report measurements of the dc magnetization, the low-field ac magnetic susceptibility, and the electrical resistivity of large (up to 0.5 ) single-grain samples of icosahedral Tb, Dy, Ho, and Er). The dc magnetization and ac magnetic susceptibility data both indicate that icosahedral Tb-Mg-Zn and Dy-Mg-Zn undergo a transition to a spin-glass state at and 3.6 K, respectively, while low-temperature ac susceptibility measurements show that and 1.3 K for Ho-Mg-Zn and Er-Mg-Zn, respectively. For the series of solid solutions the freezing temperature varies approximately as The solid solutions have lower values than for the same magnetic rare-earth concentrations (x), indicating that local moment anisotropy caused by crystalline electric-field effects plays a significant role in increasing On the other hand, angular-dependent studies show that the dc magnetization for is isotropic within the experimental uncertainty. The electrical resistivity of the single-grain samples is only weakly temperature dependent, with a small, negative Absolute values of the resistivity fall in the range between 150 and 200 μΩ cm, which is distinctly lower than the values previously reported for other thermodynamically stable icosahedral quasicrystals.
- Received 2 June 1998
DOI:https://doi.org/10.1103/PhysRevB.59.308
©1999 American Physical Society