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  -