Sample independence of magnetoelastic excitations in the rare-earth pyrochlore Tb2Ti2 O7

M. Ruminy, L. Bovo, E. Pomjakushina, M. K. Haas, U. Stuhr, A. Cervellino, R. J. Cava, M. Kenzelmann, T. Fennell

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Abstract

Recent experimental results have emphasized two aspects of Tb2Ti2O7, which have not been taken into account in previous attempts to construct theories of Tb2Ti2O7: the role of small levels of structural disorder, which appears to control the formation of a long-range ordered state of as yet unknown nature, and the importance of strong coupling between spin and lattice degrees of freedom, which results in the hybridization of crystal-field excitons and transverse acoustic phonons. In this work, we examine the juncture of these two phenomena and show that samples with strongly contrasting behavior vis-a-vis the structural disorder (i.e., with and without the transition to the ordered state), develop identical magnetoelastic coupling. We also show that the comparison between single-crystal and powder samples is more complicated than previously thought - the correlation between the lattice parameter (as a measure of superstoichiometric Tb3+) and the existence of a specific heat peak, as observed in powder samples, does not hold for single crystals.

Original languageEnglish (US)
Article number144407
JournalPhysical Review B
Volume93
Issue number14
DOIs
StatePublished - Apr 6 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ruminy, M., Bovo, L., Pomjakushina, E., Haas, M. K., Stuhr, U., Cervellino, A., Cava, R. J., Kenzelmann, M., & Fennell, T. (2016). Sample independence of magnetoelastic excitations in the rare-earth pyrochlore Tb2Ti2 O7. Physical Review B, 93(14), [144407]. https://doi.org/10.1103/PhysRevB.93.144407