Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7

Romain Sibille; Elsa Lhotel; Monica Ciomaga Hatnean; Gøran J. Nilsen; Georg Ehlers; Antonio Cervellino; Eric Ressouche; Matthias Frontzek; Oksana Zaharko; Vladimir Pomjakushin; Uwe Stuhr; Helen C. Walker; Devashibhai T. Adroja; Hubertus Luetkens; Chris Baines; Alex Amato; Geetha Balakrishnan; Tom Fennell; Michel Kenzelmann

doi:10.1038/s41467-017-00905-w

Coulomb spin liquid in anion-disordered pyrochlore Tb₂Hf₂O₇

Romain Sibille, Elsa Lhotel, Monica Ciomaga Hatnean, Gøran J. Nilsen, Georg Ehlers, Antonio Cervellino, Eric Ressouche, Matthias Frontzek, Oksana Zaharko, Vladimir Pomjakushin, Uwe Stuhr, Helen C. Walker, Devashibhai T. Adroja, Hubertus Luetkens, Chris Baines, Alex Amato, Geetha Balakrishnan, Tom Fennell, Michel Kenzelmann

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

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.

Original language	English
Article number	892
Journal	Nature Communications
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41467-017-00905-w
Publication status	Published - 1 Dec 2017
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Sibille, R., Lhotel, E., Ciomaga Hatnean, M., Nilsen, G. J., Ehlers, G., Cervellino, A., Ressouche, E., Frontzek, M., Zaharko, O., Pomjakushin, V., Stuhr, U., Walker, H. C., Adroja, D. T., Luetkens, H., Baines, C., Amato, A., Balakrishnan, G., Fennell, T., & Kenzelmann, M. (2017). Coulomb spin liquid in anion-disordered pyrochlore Tb₂Hf₂O₇ Nature Communications, 8(1), Article 892. https://doi.org/10.1038/s41467-017-00905-w

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title = "Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7 ",

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.",

author = "Romain Sibille and Elsa Lhotel and {Ciomaga Hatnean}, Monica and Nilsen, {G{\o}ran J.} and Georg Ehlers and Antonio Cervellino and Eric Ressouche and Matthias Frontzek and Oksana Zaharko and Vladimir Pomjakushin and Uwe Stuhr and Walker, {Helen C.} and Adroja, {Devashibhai T.} and Hubertus Luetkens and Chris Baines and Alex Amato and Geetha Balakrishnan and Tom Fennell and Michel Kenzelmann",

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Sibille, R, Lhotel, E, Ciomaga Hatnean, M, Nilsen, GJ, Ehlers, G, Cervellino, A, Ressouche, E, Frontzek, M, Zaharko, O, Pomjakushin, V, Stuhr, U, Walker, HC, Adroja, DT, Luetkens, H, Baines, C, Amato, A, Balakrishnan, G, Fennell, T & Kenzelmann, M 2017, 'Coulomb spin liquid in anion-disordered pyrochlore Tb₂Hf₂O₇ ', Nature Communications, vol. 8, no. 1, 892. https://doi.org/10.1038/s41467-017-00905-w

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T1 - Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7

AU - Sibille, Romain

AU - Lhotel, Elsa

AU - Ciomaga Hatnean, Monica

AU - Nilsen, Gøran J.

AU - Ehlers, Georg

AU - Cervellino, Antonio

AU - Ressouche, Eric

AU - Frontzek, Matthias

AU - Zaharko, Oksana

AU - Pomjakushin, Vladimir

AU - Stuhr, Uwe

AU - Walker, Helen C.

AU - Adroja, Devashibhai T.

AU - Luetkens, Hubertus

AU - Baines, Chris

AU - Amato, Alex

AU - Balakrishnan, Geetha

AU - Fennell, Tom

AU - Kenzelmann, Michel

PY - 2017/12/1

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N2 - 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.

AB - 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.

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JF - Nature Communications

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Coulomb spin liquid in anion-disordered pyrochlore Tb₂Hf₂O₇

Abstract

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