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All-in–all-Out Magnetic Order and Propagating Spin Waves in Sm 2 Ir 2 O 7

DOI: 10.1103/PhysRevLett.117.037201 DOI Help

Authors: C. Donnerer (London Centre for Nanotechnology) , M. C. Rahn (University of Oxford) , M. Moretti Sala (ESRF) , J. G. Vale (University College London; Ecole Polytechnique Federale de Lausanne (EPFL)) , D. Pincini (University College London; Diamond Light Source) , J. Strempfer (DESY) , M. Krisch (ESRF) , D. Prabhakaran (University of Oxford) , A. T. Boothroyd (University of Oxford) , D. F. Mcmorrow (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 117

State: Published (Approved)
Published: July 2016

Abstract: Using resonant magnetic x-ray scattering we address the unresolved nature of the magnetic ground state and the low-energy effective Hamiltonian of Sm 2 Ir 2 O 7 , 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 interactions [D=4.9(3)  meV ], which provides a consistent description of the magnetic order and excitations. In establishing that Sm 2 Ir 2 O 7 has the requisite inversion symmetry preserving AIAO magnetic ground state, our results support the notion that pyrochlore iridates may host correlated Weyl semimetals.

Subject Areas: Physics

Synchrotron: ESRF; DESY