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Magnetic correlations in a layered iridate, Na2IrO3

DOI: 10.1088/0953-8984/24/38/382201 DOI Help

Authors: S. W. Lovesey (Diamond Light Source) , A. N. Dobrynin (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics. Condensed Matter : An Institute Of Physics Journal , VOL 24 (38)

State: Published (Approved)
Published: September 2012

Abstract: Analysis of published data gathered on a sample of Na2IrO3, held deep inside the antiferromagnetic phase at 1.58 K, shows that iridium magnetic dipole moments, measured in resonant x-ray Bragg diffraction, lie in the a–c plane of the monoclinic crystal and enclose an angle ≈118° with the c-axis. These findings, together with bulk measurements, are united in a plausible magnetic ground state for an iridium ion constructed from a Kramers doublet. A magnetic space group, derived from the chemical space group C2/m (unique axis b), possesses an anti-translation, to accommodate antiferromagnetic order, and an odd, two-fold axis of rotation symmetry on the b-axis, placing Ir magnetic dipoles perpendicular to the b-axis. Anapoles (toroidal dipoles) are predicted to be likewise confined to the a–c plane, and magnetic charges forbidden.

Journal Keywords: Antiferromagnetism; Bragg Reflection; Correlations; Crystals; Ground States; Iridium Compounds; Iridium Ions; Magnetic Dipole Moments; Magnetic Dipoles; Monoclinic Lattices; Oxygen Compounds; Rotation; Sodium Compounds; Space Groups; Symmetry; Temperature

Subject Areas: Physics

Technical Areas: