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

Lucy Clark, Jean C. Orain, Fabrice Bert, Mark De Vries, Farida H. Aidoudi, Russell E. Morris, Philip Lightfoot, James Lord, Mark T. F. Telling, Patrick Bonville, Paul Attfield, Philippe Mendels, Andrew Harrison

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The vanadium oxyfluoride [NH4]2[C7H14N][V7O6F18] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S=1/2 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=1/2 kagome physics, and that it displays a gapless spin liquid ground state.

Original languageEnglish
Article number207208
Pages (from-to)207208
Number of pages4
JournalPhysical Review Letters
Publication statusPublished - 17 May 2013


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