Determination of the Spin−Lattice Relevant for the Quaternary Magnetic Oxide Bi4Cu3V2O14 on the Basis of Tight-Binding and Density Functional Calculations

Hyun-Joo Koo* and Myung-Hwan Whangbo*
Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, Korea, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
Inorg. Chem., 2008, 47 (11), pp 4779–4784
DOI: 10.1021/ic800216j
Publication Date (Web): May 3, 2008
Copyright © 2008 American Chemical Society
* To whom correspondence should be addressed. E-mail: hjkoo@khu.ac.kr (H.-J.K); mike_whangbo@ncsu.edu (M.-H.W.).

Abstract

Abstract Image

The quaternary magnetic oxide Bi4Cu3V2O14 consists of Cu4O8 triple chains made up of corner-sharing CuO4 square planes. To determine its spin−lattice, the spin exchange interactions of Bi4Cu3V2O14 were evaluated by performing a spin dimer analysis based on tight-binding calculations and a mapping analysis based on first principles density functional theory calculations. Both calculations show that the spin−lattice of Bi4Cu3V2O14 is not an antiferromagnetically coupled diamond chain, which results from an idealized view of the structure of the Cu4O8 triple chain and a neglect of super-superexchange interactions. The correct spin−lattice is an antiferromagnetic chain made up of antiferromagnetic linear trimers coupled through their midpoints via super-superexchange interaction, which predicts that Bi4Cu3V2O14 has an antiferromagnetic spin ground state and has no spin frustration, both in agreement with experiment.

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History

  • Published In Issue June 02, 2008
  • Article ASAPMay 03, 2008
  • Received: February 1, 2008

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