Crucial Role of Site Disorder and Frustration in Unusual Magnetic Properties of Quasi-2D Triangular Lattice Antimonate Na4FeSbO6

Elena A. Zvereva*, Igor A. Presniakov, Myung Hwan Whangbo, Hyun Joo Koo, Tatyana V. Frantsuzenko, Olga A. Savelieva, Alexey V. Sobolev, Vladimir B. Nalbandyan, Pei Shan Shih, Jen Che Chiang, Jenn Min Lee, Jin Ming Chen, Jiunn-Yuan Lin, Bernd Büchner, Alexander N. Vasiliev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The effect of antisite disorder in the layered sodium iron antimonate Na4FeSbO6 was examined both experimentally and theoretically. The magnetic susceptibility and specific heat measurements show that Na4FeSbO6 does not undergo a long-range antiferromagnetic order, unlike its structural analog Li4FeSbO6. The electron spin resonance yields the complicated picture of coexistence of two magnetic subsystems corresponding to two different Fe cation positions in the lattice (regular and antisite) and driving the magnetic properties of the Na4FeSbO6. This conclusion found perfect confirmation from both the Mössbauer and X-ray absorption data which show the presence of two kinds of Fe3+ ions being in high-spin Fe3+ (S = 5/2) and low-spin Fe3+ (S = 1/2) states. These findings arise from the antisite disorder between the Fe3+ and Sb5+ ions in the (NaFeSbO6)3− layers of Na4FeSbO6. Our density functional calculations show that the Fe3+ ions located at the Sb5+ sites exist as low-spin Fe3+ ions, and that the spins of each Fe3+ (S = 5/2)–Fe3+ (S = 1/2)–Fe3+ (S = 5/2) trimer generated by the antisite disorder has a ferrimagnetic arrangement Fe3+↑–Fe3+↓–Fe3+↑, which enhances the magnetization of Na4FeSbO6 and leads to an apparently positive Curie–Weiss temperature.

Original languageEnglish
Pages (from-to)1121-1145
Number of pages25
JournalApplied Magnetic Resonance
Volume46
Issue number10
DOIs
StatePublished - 22 Oct 2015

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