Please use this identifier to cite or link to this item:
https://ah.lib.nccu.edu.tw/handle/140.119/70492
題名: | Magnetic correlations in HoxTb2−xTi2O7 | 作者: | 陳洋元 L. J. Chang;W. Schweika;Kao,Y. -J.;Chou,Y. Z.;J. Perßon;Chen,Y. Y. |
貢獻者: | 應物所 | 日期: | 2011 | 上傳時間: | 9-Oct-2014 | 摘要: | Polycrystalline samples of HoxTb2−xTi2O7 (0 < x < 2) have been prepared and characterized for their structural and magnetic properties. The parent compounds of this solid solution are the spin ice Ho2Ti2O7 and the spin liquid Tb2Ti2O7. Specific-heat measurements on HoTbTi2O7 (x = 1.0) reveal the absence of a long-range order state above 0.5 K. The integrated entropies of all HoxTb2−xTi2O7 specimens up to 30 K scale well with the ratio of spin ice and spin liquid in the composition. The neutron diffraction spectrum of HoTbTi2O7 exhibits a dipolar spin-ice pattern and can be well described by mean-field theory for 111 Ising spins, nearest-neighbor exchange, and dipolar interactions. Inelastic neutron scattering on HoTbTi2O7 reveals two dispersionless excitations, one of ∼2.5 meV out of the ground state, and a 4-meV transition out of an excited state. We argue that these data suggest that the very strong single-ion effects of Ho2Ti2O7 and Tb2Ti2O7 persist in the HoxTb2−xTi2O7(0 < x < 2) solid solution, whereas the Tb-Ho correlations are weak, resulting in small shifts in the energy scales but with no dramatic effect on the bulk properties. | 關聯: | Physical review. B,83(14),144413 | 資料類型: | article | DOI: | http://dx.doi.org/10.1103/PhysRevB.83.144413 |
Appears in Collections: | 期刊論文 |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
144413.pdf | 604.76 kB | Adobe PDF2 | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.