TY - JOUR AV - public IS - 3 VL - 117 N2 - 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. N1 - Copyright © 2016 American Physical Society TI - All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7 JF - Physical Review Letters ID - discovery1485867 Y1 - 2016/07/15/ A1 - Donnerer, C A1 - Rahn, MC A1 - Sala, MM A1 - Vale, JG A1 - Pincini, D A1 - Strempfer, J A1 - Krisch, M A1 - Prabhakaran, D A1 - Boothroyd, AT A1 - McMorrow, DF UR - http://dx.doi.org/10.1103/PhysRevLett.117.037201 SN - 0031-9007 ER -