Magnetic and transport properties of single-grain R-Mg-Zn icosahedral quasicrystals [R=Y, (Y{sub 1{minus}x}Gd{sub x}), (Y{sub 1{minus}x}Tb{sub x}), Tb, Dy, Ho, and Er]
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- Laboratorium fuer Festkoerperphysick, ETH-Hoenggerberg, CH-8093 Zurich (Switzerland)
- Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)
We report measurements of the dc magnetization, the low-field ac magnetic susceptibility, and the electrical resistivity of large (up to 0.5 cm{sup 3}) single-grain samples of icosahedral R-Mg-Zn (R=Y, 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 T{sub f}=5.8 and 3.6 K, respectively, while low-temperature ac susceptibility measurements show that T{sub f}=1.95 and 1.3 K for Ho-Mg-Zn and Er-Mg-Zn, respectively. For the series of solid solutions (Y{sub 1{minus}x}Tb{sub x})-Mg-Zn, the freezing temperature T{sub f} varies approximately as x{sup 2/3}. The (Y{sub 1{minus}x}Gd{sub x})-Mg-Zn solid solutions have lower T{sub f} values than (Y{sub 1{minus}x}Tb{sub x})-Mg-Zn for the same magnetic rare-earth concentrations ({ital x}), indicating that local moment anisotropy caused by crystalline electric-field effects plays a significant role in increasing T{sub f}. On the other hand, angular-dependent studies show that the dc magnetization for T{gt}T{sub f} is isotropic within the experimental uncertainty. The electrical resistivity {rho}(T) of the single-grain samples is only weakly temperature dependent, with a small, negative d{rho}/dT. Absolute values of the resistivity fall in the range between 150 and 200 {mu}{Omega}thinspcm, which is distinctly lower than the values previously reported for other thermodynamically stable icosahedral quasicrystals. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 289190
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 59, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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