Sample independence of magnetoelastic excitations in the rare-earth pyrochlore Tb 2 Ti 2 O 7
Author(s): Ruminy, M.; Bovo, Laura; Pomjakushina, Ekaterina V.; Haas, M.K.; Stuhr, Uwe; et al
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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. © 2016 American Physical Society. |
Publication Date: | Apr-2016 |
Electronic Publication Date: | 6-Apr-2016 |
Citation: | 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. Physical Review B, 93 (14), 10.1103/PhysRevB.93.144407 |
DOI: | doi:10.1103/PhysRevB.93.144407 |
ISSN: | 2469-9950 |
EISSN: | 2469-9969 |
Pages: | 93.14:144407-1 - 144407-8 |
Type of Material: | Journal Article |
Journal/Proceeding Title: | Physical Review B |
Version: | Final published version. Article is made available in OAR by the publisher's permission or policy. |
Notes: | Physical Review B. Volume 93, Issue 14, 6 April 2016, Article number 144407. |
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