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Quenched crystal-field disorder and magnetic liquid ground states in Tb 2 Sn 2 − x Ti x O 7

Author(s): Gaulin, Bruce D.; Kermarrec, Edwin; Dahlberg, Maria L.; Matthews, M.J.; Bert, Fabrice; et al

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Abstract: Solid solutions of the "soft" quantum spin ice pyrochlore magnets Tb2B2O7 with B = Ti and Sn display a novel magnetic ground state in the presence of strong B-site disorder, characterized by a low susceptibility and strong spin fluctuations to temperatures below 0.1 K. These materials have been studied using ac susceptibility and μSR techniques to very low temperatures, and time-of-flight inelastic neutron scattering techniques to 1.5 K. Remarkably, neutron spectroscopy of the Tb3+ crystal-field levels appropriate to high B-site mixing (0.5<x<1.5 in Tb2Sn2-xTixO7) reveal that the doublet ground and first excited states present as continua in energy, while transitions to singlet excited states at higher energies simply interpolate between those of the end members of the solid solution. The resulting ground state suggests an extreme version of a random-anisotropy magnet, with many local moments and anisotropies, depending on the precise local configuration of the six B sites neighboring each magnetic Tb3+ ion. © 2015 American Physical Society.
Publication Date: Jun-2015
Electronic Publication Date: 18-Jun-2015
Citation: Gaulin, B.D., Kermarrec, E., Dahlberg, M.L., Matthews, M.J., Bert, F., Zhang, J., Mendels, P., Fritsch, K., Granroth, G.E., Jiramongkolchai, P., Amato, A., Baines, C., Cava, R.J., Schiffer, P. (2015). Quenched crystal-field disorder and magnetic liquid ground states in. Physical Review B, 91 (24), 10.1103/PhysRevB.91.245141
DOI: doi:10.1103/PhysRevB.91.245141
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 91.24:245141-1 - 245141-6
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 91, Issue 24, 18 June 2015, Article number 245141.

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