Block Magnetic Excitations in the Orbitally Selective Mott InsulatorBaFe2Se3
| Autor: | Tyrel M. McQueen, Shan Wu, Martin Mourigal, J. M. Caron, Matthew B. Stone, Collin Broholm, James R. Neilson |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Spins Heisenberg model Condensed Matter - Superconductivity Mott insulator FOS: Physical sciences General Physics and Astronomy Inelastic neutron scattering Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Spin wave Lattice (order) Magnet Condensed Matter::Strongly Correlated Electrons Ground state |
| Zdroj: | Physical Review Letters. 115 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.115.047401 |
| Popis: | Iron pnictides and selenides display a variety of unusual magnetic phases originating from the interplay between electronic, orbital, and lattice degrees of freedom. Using powder inelastic neutron scattering on the two-leg ladder BaFe2Se3, we fully characterize the static and dynamic spin correlations associated with the Fe4 block state, an exotic magnetic ground state observed in this low-dimensional magnet and in Rb0.89Fe1.58Se2. All the magnetic excitations of the Fe4 block state predicted by an effective Heisenberg model with localized spins are observed below 300 meV and quantitatively reproduced. However, the data only account for 16 mub^2 per Fe2+, approximatively 2/3 of the total spectral weight expected for localized S=2 moments. Our results highlight how orbital degrees of freedom in iron-based magnets can conspire to stabilize an exotic magnetic state. 5 pages, 3 figures, 1 table |
| Databáze: | OpenAIRE |
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