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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 15:48:26 (UTC+8)
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
dc.contributor 應物所en_US
dc.creator (作者) 陳洋元zh_TW
dc.creator (作者) L. J. Chang;W. Schweika;Kao,Y. -J.;Chou,Y. Z.;J. Perßon;Chen,Y. Y.en_US
dc.date (日期) 2011en_US
dc.date.accessioned 9-Oct-2014 15:48:26 (UTC+8)-
dc.date.available 9-Oct-2014 15:48:26 (UTC+8)-
dc.date.issued (上傳時間) 9-Oct-2014 15:48:26 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/70492-
dc.description.abstract (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.en_US
dc.format.extent 619270 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) Physical review. B,83(14),144413en_US
dc.title (題名) Magnetic correlations in HoxTb2−xTi2O7en_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1103/PhysRevB.83.144413-
dc.doi.uri (DOI) http://dx.doi.org/10.1103/PhysRevB.83.144413-