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.
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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 |
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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 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: | https://discovery.ucl.ac.uk/id/eprint/1485867 |
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