Magnetic correlations in HoxTb2-xTi2O 7

L. J. Chang, W. Schweika, Y. J. Kao, Y. Z. Chou, J. Perßon, Th Brückel, Hong-Chang Yang, Y. Y. Chen, J. S. Gardner

Research output: Contribution to journalArticle

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Abstract

Polycrystalline samples of HoxTb2-xTi 2O7 (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 Ho xTb2-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 HoxTb 2-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.

Original languageEnglish
Article number144413
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number14
DOIs
Publication statusPublished - 2011 Apr 18

Fingerprint

Ice
Solid solutions
Thermal variables measurement
Mean field theory
ice
Inelastic neutron scattering
Liquids
Neutron diffraction
Electron transitions
Excited states
Ground state
Specific heat
Structural properties
Magnetic properties
solid solutions
Entropy
Ions
liquids
Chemical analysis
excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Chang, L. J., Schweika, W., Kao, Y. J., Chou, Y. Z., Perßon, J., Brückel, T., ... Gardner, J. S. (2011). Magnetic correlations in HoxTb2-xTi2O 7. Physical Review B - Condensed Matter and Materials Physics, 83(14), [144413]. https://doi.org/10.1103/PhysRevB.83.144413

Magnetic correlations in HoxTb2-xTi2O 7. / Chang, L. J.; Schweika, W.; Kao, Y. J.; Chou, Y. Z.; Perßon, J.; Brückel, Th; Yang, Hong-Chang; Chen, Y. Y.; Gardner, J. S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 14, 144413, 18.04.2011.

Research output: Contribution to journalArticle

Chang, LJ, Schweika, W, Kao, YJ, Chou, YZ, Perßon, J, Brückel, T, Yang, H-C, Chen, YY & Gardner, JS 2011, 'Magnetic correlations in HoxTb2-xTi2O 7', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 14, 144413. https://doi.org/10.1103/PhysRevB.83.144413
Chang LJ, Schweika W, Kao YJ, Chou YZ, Perßon J, Brückel T et al. Magnetic correlations in HoxTb2-xTi2O 7. Physical Review B - Condensed Matter and Materials Physics. 2011 Apr 18;83(14). 144413. https://doi.org/10.1103/PhysRevB.83.144413
Chang, L. J. ; Schweika, W. ; Kao, Y. J. ; Chou, Y. Z. ; Perßon, J. ; Brückel, Th ; Yang, Hong-Chang ; Chen, Y. Y. ; Gardner, J. S. / Magnetic correlations in HoxTb2-xTi2O 7. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 83, No. 14.
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