TY - JOUR
T1 - Magnetic excitations in the crystalline and quasicrystalline Zn-Mg-Ho phases
AU - Sato, T. J.
AU - Tsai, A. P.
N1 - Funding Information:
The authors thank Drs H. Takakura, K. Shibata, H. Kadowaki, T. Onimaru and J. W. Lynn for stimulating discussions. This work was partly supported by a Grant-in-Aid for Encouragement of Young Scientists (B) (No. 16760537) and by a Grant-in-Aid for Creative Scientific Research (No. 16GS0417) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2007/7
Y1 - 2007/7
N2 - A comparative study has been carried out on magnetic excitations in the primitive- (p-) and face-centred- (f-) icosahedral quasicrystalline phases, as well as crystalline phase, in the Zn-Mg-Ho system. The magnetic excitation spectrum in both the quasicrystalline phases has only a broad quasielastic peak centred at the elastic position; the signal for the positive energy-transfer () side is found to be almost temperature independent in a wide temperature range 1.5 T 200K. The magnetic excitation spectrum in the crystalline Zn65.2Mg27.9Ho6.9 phase is quite similar to that of the quasicrystalline phases at high temperatures; however, well-defined inelastic peaks due to crystalline-electric-field (CEF) splitting levels appear as the temperature is decreased. The appearance of the sharp CEF peaks confirms well-defined site symmetry around the rare-earth sites in the hexagonal phase, whereas the temperature-independent quasielastic signal suggests anomalous spin fluctuations in the quasicrystalline phases.
AB - A comparative study has been carried out on magnetic excitations in the primitive- (p-) and face-centred- (f-) icosahedral quasicrystalline phases, as well as crystalline phase, in the Zn-Mg-Ho system. The magnetic excitation spectrum in both the quasicrystalline phases has only a broad quasielastic peak centred at the elastic position; the signal for the positive energy-transfer () side is found to be almost temperature independent in a wide temperature range 1.5 T 200K. The magnetic excitation spectrum in the crystalline Zn65.2Mg27.9Ho6.9 phase is quite similar to that of the quasicrystalline phases at high temperatures; however, well-defined inelastic peaks due to crystalline-electric-field (CEF) splitting levels appear as the temperature is decreased. The appearance of the sharp CEF peaks confirms well-defined site symmetry around the rare-earth sites in the hexagonal phase, whereas the temperature-independent quasielastic signal suggests anomalous spin fluctuations in the quasicrystalline phases.
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U2 - 10.1080/14786430701365025
DO - 10.1080/14786430701365025
M3 - Article
AN - SCOPUS:34547296689
SN - 1478-6435
VL - 87
SP - 2939
EP - 2946
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 18-21
ER -