Gapless Spin Liquid Ground State in the S=1/2 Vanadium Oxyfluoride Kagome Antiferromagnet [NH4 ]2[C7H14N][V7O6F18]

L. Clark, J. C. Orain, F. Bert, M. A. De Vries, Farida Himeur Himeur, Russell Edward Morris, Philip Lightfoot, J. S. Lord, M. T. F. Telling, P. Bonville, J. P. Attfield*, P. Mendels, A. Harrison

*Corresponding author for this work

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Abstract

The vanadium oxyfluoride [NH4]2[C7H14N][V7O6F18] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S=½ kagome planes of V4+ d1 ions with S=1 V3+ d2 ions located between the kagome layers. Muon spin relaxation measurements demonstrate the absence of spin freezing down to 40 mK despite an energy scale of 60 K for antiferromagnetic exchange interactions. From magnetization and heat capacity measurements we conclude that the S=1 spins of the interplane V3+ ions are weakly coupled to the kagome layers, such that DQVOF can be viewed as an experimental model for S=½ kagome physics, and that it displays a gapless spin liquid ground state.

Original languageEnglish
Article number207208
Number of pages5
JournalPhysical Review Letters
Volume110
Issue number20
DOIs
Publication statusPublished - 16 May 2013

Keywords

  • Lattice
  • Vanadium oxyfluoride
  • Antiferromagnetic exchange
  • Kagome layers

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