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024 7 _ |a 10.1103/PhysRevB.83.144413
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037 _ _ |a PreJuSER-15570
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Physics, Condensed Matter
100 1 _ |0 P:(DE-HGF)0
|a Chang, L. J.
|b 0
245 _ _ |a Magnetic correlations in HoxTb2-xTi2O7
260 _ _ |a College Park, Md.
|b APS
|c 2011
300 _ _ |a 144413
336 7 _ |a Journal Article
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440 _ 0 |0 4919
|a Physical Review B
|v 83
|x 1098-0121
|y 14
500 _ _ |a This work was supported in Taiwan by Grants No. NSC 96-2739-M-213-001, No. NSC 99-2112-M-007-020 (LJC), No. NSC 97-2628-M-002-011-MY3, and No. NTU 98R0066-65, -68 (Y.Z.C. and Y.J.K.).
520 _ _ |a 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 similar to 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.
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