Magnetoelastic excitations in the pyrochlore spin liquid Tb2Ti2O7.

Fennell, T; Kenzelmann, M; Roessli, B; Mutka, H; Ollivier, J; Ruminy, M; Stuhr, U; Zaharko, O; Bovo, L; Cervellino, A; Haas, M K; Cava, R J

Fennell, T; Kenzelmann, M; Roessli, B; Mutka, H; Ollivier, J; Ruminy, M; Stuhr, U; Zaharko, O; Bovo, L; Cervellino, A; Haas, M K; Cava, R J.

Afiliación

Fennell T; Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Kenzelmann M; Laboratory for Developments and Methods, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Roessli B; Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Mutka H; Institut Laue Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France.
Ollivier J; Institut Laue Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France.
Ruminy M; Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Stuhr U; Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Zaharko O; Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Bovo L; London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom.
Cervellino A; Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Haas MK; Department of Chemistry, Princeton University, Princeton, New Jersey 08540, USA.
Cava RJ; Department of Chemistry, Princeton University, Princeton, New Jersey 08540, USA.

Phys Rev Lett ; 112(1): 017203, 2014 Jan 10.

Article en En | MEDLINE | ID: mdl-24483925

RESUMEN

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.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2014 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Estados Unidos

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