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Strange magnetic multipoles and neutron diffraction by an iridate perovskite (Sr2IrO4)

DOI: 10.1088/0953-8984/26/32/322201 DOI Help
PMID: 25055164 PMID Help

Authors: Stephen Lovesey (Diamond Light Source) , Dmitry Khalyavin (ISIS Pulsed Neutron and Muon Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 26 (32)

State: Published (Approved)
Published: August 2014

Abstract: A theoretical investigation of a plausible construct for electronic structure in iridate perovskites demonstrates the existence of magnetic multipoles hitherto not identified. The strange multipoles, which are parity-even, time-odd and even rank tensors, are absent from the so-called j(eff) = 1/2 model. We prove that the strange multipoles contribute to magnetic neutron diffraction, and we estimate their contribution to intensities of Bragg spots for Sr2IrO4. The construct encompasses the j(eff) = 1/2 model, and it is consistent with the known magnetic structure, ordered magnetic moment, and published resonant x-ray Bragg diffraction data. Over and above time-odd quadrupoles and hexadecapoles, whose contribution changes neutron Bragg intensities by an order of magnitude, according to our estimates, are relatively small triakontadipoles recently proposed as the primary magnetic order-parameter of Sr2IrO4.

Subject Areas: Physics


Technical Areas: Theoretical Physics