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Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7
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Sibille, Romain, Lhotel, Elsa, Ciomaga Hatnean, Monica, Nilsen, Gøran J., Ehlers, Georg, Cervellino, Antonio, Ressouche, Eric, Frontzek, Matthias, Zaharko, Oksana, Pomjakushin, Vladimir, Stuhr, Uwe, Walker, Helen C., Adroja, Devashibhai T., Luetkens, Hubertus, Baines, Chris, Amato, Alex, Balakrishnan, Geetha, Fennell, Tom and Kenzelmann, Michel (2017) Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7. Nature Communications, 8 (1). 892. doi:10.1038/s41467-017-00905-w ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/s41467-017-00905-w
Abstract
The charge ordered structure of ions and vacancies characterizing rare-earth pyrochlore oxides serves as a model for the study of geometrically frustrated magnetism. The organization of magnetic ions into networks of corner-sharing tetrahedra gives rise to highly correlated magnetic phases with strong fluctuations, including spin liquids and spin ices. It is an open question how these ground states governed by local rules are affected by disorder. Here we demonstrate in the pyrochlore Tb2Hf2O7, that the vicinity of the disordering transition towards a defective fluorite structure translates into a tunable density of anion Frenkel disorder while cations remain ordered. Quenched random crystal fields and disordered exchange interactions can therefore be introduced into otherwise perfect pyrochlore lattices of magnetic ions. We show that disorder can play a crucial role in preventing long-range magnetic order at low temperatures, and instead induces a strongly fluctuating Coulomb spin liquid with defect-induced frozen magnetic degrees of freedom.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Condensed matter -- Magnetic properties, Magnetic ions, Magnetic structure | ||||||||
| Journal or Publication Title: | Nature Communications | ||||||||
| Publisher: | Nature Publishing Group | ||||||||
| ISSN: | 2041-1723 | ||||||||
| Official Date: | 12 October 2017 | ||||||||
| Dates: |
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| Volume: | 8 | ||||||||
| Number: | 1 | ||||||||
| Number of Pages: | 9 | ||||||||
| Article Number: | 892 | ||||||||
| DOI: | 10.1038/s41467-017-00905-w | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Copyright Holders: | Creative Commons Attribution 4.0 International License | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
| Grant number: | EP/M028771/1 | ||||||||
| Open Access Version: |
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