Ruminy, M;
Bovo, L;
Pomjakushina, E;
Haas, MK;
Stuhr, U;
Cervellino, A;
Cava, RJ;
... Fennell, T; + view all
(2016)
Sample independence of magnetoelastic excitations in the rare earth pyrochlore Tb2Ti2O7.
Physical Review B
, 93
(14)
, Article 144407. 10.1103/PhysRevB.93.144407.
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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 quenched 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 quenched disorder (i.e. with and without the transition to the ordered state), have identical magnetoelastic coupling. We also show that the comparison between single crystal and powder samples is more complicated than previously thought - the correlation between 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.
| Type: | Article |
|---|---|
| Title: | Sample independence of magnetoelastic excitations in the rare earth pyrochlore Tb2Ti2O7 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.93.144407 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevB.93.144407 |
| Language: | English |
| Additional information: | Copyright © 2016 American Physical Society. |
| UCL classification: | UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1482199 |
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