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All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7

Donnerer, C; Rahn, MC; Sala, MM; Vale, JG; Pincini, D; Strempfer, J; Krisch, M; ... McMorrow, DF; + view all (2016) All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7. Physical Review Letters , 117 (3) , Article 037201. 10.1103/PhysRevLett.117.037201. Green open access

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Abstract

Using resonant magnetic x-ray scattering we address the unresolved nature of the magnetic groundstate and the low-energy effective Hamiltonian of Sm2Ir2O7, a prototypical pyrochlore iridate with a finite temperature metal-insulator transition. Through a combination of elastic and inelastic measurements, we show that the magnetic ground state is an all-in all-out (AIAO) antiferromagnet. The magnon dispersion indicates significant electronic correlations and can be well-described by a minimal Hamiltonian that includes Heisenberg exchange (J = 27:3(6) meV) and Dzyaloshinskii- Moriya interaction (D = 4:9(3) meV), which provides a consistent description of the magnetic order and excitations. In establishing that Sm2Ir2O7 has the requisite inversion symmetry preserv- ing AIAO magnetic groundstate, our results support the notion that pyrochlore iridates may host correlated Weyl semimetals.

Type: Article
Title: All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.117.037201
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.117.037201
Language: English
Additional information: Copyright © 2016 American Physical Society
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1485867
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