Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2O7
We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr(3)Fe(2)O(7), which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe(4+) moments adopt incommensurate spiral order below T(N) = 115 K and provide a comprehensive...
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| Veröffentlicht in: | Physical review letters 2014-10, Vol.113 (14), p.147206-147206 |
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| creator | Kim, J-H Jain, Anil 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 |
| description | We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr(3)Fe(2)O(7), which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe(4+) moments adopt incommensurate spiral order below T(N) = 115 K 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 Sr(3)Fe(2)O(7) 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. |
| doi_str_mv | 10.1103/PhysRevLett.113.147206 |
| format | Article |
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We show that the Fe(4+) moments adopt incommensurate spiral order below T(N) = 115 K 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 Sr(3)Fe(2)O(7) 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.</abstract><cop>United States</cop><pmid>25325658</pmid><doi>10.1103/PhysRevLett.113.147206</doi><tpages>1</tpages></addata></record> |
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| source | American Physical Society Journals |
| subjects | Correlation Dynamic tests Exchange Excitation spectra Ferromagnetism Mathematical models Metal-insulator transition Spirals |
| title | Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2O7 |
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