Frustration by competing interactions in the highly-distorted double perovskites La2NaB'O6 (B' = Ru, Os)

Abstract

The usual classical behaviour of S = 3/2, B-site ordered double perovskites generally results in simple, commensurate magnetic ground states. In contrast, heat capacity and neutron powder diffraction measurements for the S = 3/2 systems La2NaB'O6 (B' = Ru, Os) reveal an incommensurate magnetic ground state for La2NaRuO6 and a drastically suppressed ordered moment for La2NaOsO6. This behaviour is attributed to the large monoclinic structural distortions of these double perovskites. The distortions have the effect of weakening the nearest neighbour superexchange interactions, presumably to an energy scale that is comparable to the next nearest neighbour superexchange. The exotic ground states in these materials can then arise from a competition between these two types of antiferromagnetic interactions, providing a novel mechanism for achieving frustration in the double perovskite family.

7 pages, 6 figures, submitted to PRB

References in corpus (6)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Ferromagnetism in the Mott insulator Ba2NaOsO6
• Spin-orbit coupling in $d^2$ ordered double perovskites
• Magnetically driven metal-insulator transition in NaOsO3
• Triplet and in-gap magnetic states in the ground state of the quantum frustrated FCC antiferromagnet Ba2YMoO6
• Magnetic structure determination of Ca${}_3$LiOsO${}_6$ using neutron and x-ray scattering

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