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Magnetoelastic Excitations in the Pyrochlore Spin Liquid

Author(s): Fennell, T; Kenzelmann, M; Roessli, B; Mutka, H; Ollivier, J; et al

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Abstract: At low temperatures, Tb2Ti2O7 enters a spin liquid state, despite expectations of magnetic order and/or a structural distortion. Using neutron scattering, we have discovered that in this spin liquid state an excited crystal field level is coupled to a transverse acoustic phonon, forming a hybrid excitation. Magnetic and phononlike branches with identical dispersion relations can be identified, and the hybridization vanishes in the paramagnetic state. We suggest that Tb2Ti2O7 is aptly named a “magnetoelastic spin liquid” and that the hybridization of the excitations suppresses both magnetic ordering and the structural distortion. The spin liquid phase of Tb2Ti2O7 can now be regarded as a Coulomb phase with propagating bosonic spin excitations.
Publication Date: Jan-2014
Electronic Publication Date: 8-Jan-2014
Citation: Fennell, T, Kenzelmann, M, Roessli, B, Mutka, H, Ollivier, J, Ruminy, M, Stuhr, U, Zaharko, O, Bovo, L, Cervellino, A, Haas, MK, Cava, RJ. (2014). Magnetoelastic Excitations in the Pyrochlore Spin Liquid. Physical Review Letters, 112 (1), 10.1103/PhysRevLett.112.017203
DOI: doi:10.1103/PhysRevLett.112.017203
ISSN: 0031-9007
EISSN: 1079-7114
Pages: 017203-1 - 017203-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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