Donnerer, C; Rahn, MC; Sala, MM; Vale, JG; Pincini, D; Strempfer, J; Krisch, M; ... McMorrow, DF; + view all Donnerer, C; Rahn, MC; Sala, MM; Vale, JG; Pincini, D; Strempfer, J; Krisch, M; Prabhakaran, D; Boothroyd, AT; McMorrow, DF; - view fewer (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.

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