Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7

J. H. Kim; Anil Jain; M. Reehuis; G. Khaliullin; D. C. Peets; C. Ulrich; J. T. Park; E. Faulhaber; A. Hoser; H. C. Walker; D. T. Adroja; A. C. Walters; D. S. Inosov; A. Maljuk; B. Keimer

doi:10.1103/PhysRevLett.113.147206

Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7

J. H. Kim, Anil Jain, M. Reehuis, G. Khaliullin, D. C. Peets, C. Ulrich, J. T. Park, E. Faulhaber, A. Hoser, H. C. Walker, D. T. Adroja, A. C. Walters, D. S. Inosov, A. Maljuk, B. Keimer

Physics

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39 Citations (Scopus)

Abstract

We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr3Fe2O7, which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe4+ moments adopt incommensurate spiral order below TN=115K and provide a comprehensive description of the corresponding spin-wave excitations. The observed magnetic order and excitation spectra can be well understood in terms of an effective spin Hamiltonian with interactions ranging up to third-nearest-neighbor pairs. The results indicate that the helical magnetism in Sr3Fe2O7 results from competition between ferromagnetic double-exchange and antiferromagnetic superexchange interactions whose strengths become comparable near the metal-insulator transition. They thus confirm a decades-old theoretical prediction and provide a firm experimental basis for models of magnetic correlations in strongly correlated metals.

Original language	English
Article number	147206
Journal	Physical Review Letters
Volume	113
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.113.147206
Publication status	Published - 3 Oct 2014

ASJC Scopus subject areas

General Physics and Astronomy

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Kim, J. H., Jain, A., Reehuis, M., Khaliullin, G., Peets, D. C., Ulrich, C., Park, J. T., Faulhaber, E., Hoser, A., Walker, H. C., Adroja, D. T., Walters, A. C., Inosov, D. S., Maljuk, A., & Keimer, B. (2014). Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7. Physical Review Letters, 113(14), Article 147206. https://doi.org/10.1103/PhysRevLett.113.147206

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title = "Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7",

abstract = "We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr3Fe2O7, which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe4+ moments adopt incommensurate spiral order below TN=115K and provide a comprehensive description of the corresponding spin-wave excitations. The observed magnetic order and excitation spectra can be well understood in terms of an effective spin Hamiltonian with interactions ranging up to third-nearest-neighbor pairs. The results indicate that the helical magnetism in Sr3Fe2O7 results from competition between ferromagnetic double-exchange and antiferromagnetic superexchange interactions whose strengths become comparable near the metal-insulator transition. They thus confirm a decades-old theoretical prediction and provide a firm experimental basis for models of magnetic correlations in strongly correlated metals.",

author = "Kim, {J. H.} and Anil Jain and M. Reehuis and G. Khaliullin and Peets, {D. C.} and C. Ulrich and Park, {J. T.} and E. Faulhaber and A. Hoser and Walker, {H. C.} and Adroja, {D. T.} and Walters, {A. C.} and Inosov, {D. S.} and A. Maljuk and B. Keimer",

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year = "2014",

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day = "3",

doi = "10.1103/PhysRevLett.113.147206",

language = "English",

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Kim, JH, Jain, A, Reehuis, M, Khaliullin, G, Peets, DC, Ulrich, C, Park, JT, Faulhaber, E, Hoser, A, Walker, HC, Adroja, DT, Walters, AC, Inosov, DS, Maljuk, A & Keimer, B 2014, 'Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7', Physical Review Letters, vol. 113, no. 14, 147206. https://doi.org/10.1103/PhysRevLett.113.147206

TY - JOUR

T1 - Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7

AU - Kim, J. H.

AU - Jain, Anil

AU - Reehuis, M.

AU - Khaliullin, G.

AU - Peets, D. C.

AU - Ulrich, C.

AU - Park, J. T.

AU - Faulhaber, E.

AU - Hoser, A.

AU - Walker, H. C.

AU - Adroja, D. T.

AU - Walters, A. C.

AU - Inosov, D. S.

AU - Maljuk, A.

AU - Keimer, B.

PY - 2014/10/3

Y1 - 2014/10/3

N2 - We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr3Fe2O7, which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe4+ moments adopt incommensurate spiral order below TN=115K and provide a comprehensive description of the corresponding spin-wave excitations. The observed magnetic order and excitation spectra can be well understood in terms of an effective spin Hamiltonian with interactions ranging up to third-nearest-neighbor pairs. The results indicate that the helical magnetism in Sr3Fe2O7 results from competition between ferromagnetic double-exchange and antiferromagnetic superexchange interactions whose strengths become comparable near the metal-insulator transition. They thus confirm a decades-old theoretical prediction and provide a firm experimental basis for models of magnetic correlations in strongly correlated metals.

AB - We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr3Fe2O7, which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe4+ moments adopt incommensurate spiral order below TN=115K and provide a comprehensive description of the corresponding spin-wave excitations. The observed magnetic order and excitation spectra can be well understood in terms of an effective spin Hamiltonian with interactions ranging up to third-nearest-neighbor pairs. The results indicate that the helical magnetism in Sr3Fe2O7 results from competition between ferromagnetic double-exchange and antiferromagnetic superexchange interactions whose strengths become comparable near the metal-insulator transition. They thus confirm a decades-old theoretical prediction and provide a firm experimental basis for models of magnetic correlations in strongly correlated metals.

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JO - Physical Review Letters

JF - Physical Review Letters

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Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2 O7

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