Gapless Spin Liquid Ground State in the S=1/2 Vanadium Oxyfluoride Kagome Antiferromagnet [NH4 ]2[C7H14N][V7O6F18]
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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.
Clark , L , Orain , J C , Bert , F , De Vries , M A , Himeur , F H , Morris , R E , Lightfoot , P , Lord , J S , Telling , M T F , Bonville , P , Attfield , J P , Mendels , P & Harrison , A 2013 , ' Gapless Spin Liquid Ground State in the S=1/2 Vanadium Oxyfluoride Kagome Antiferromagnet [NH 4 ] 2 [C 7 H 14 N][V 7 O 6 F 18 ] ' Physical Review Letters , vol 110 , no. 20 , 207208 . DOI: 10.1103/PhysRevLett.110.207208
Physical Review Letters
© 2013 American Physical Society. The online publisher's version of this article can be found at http://prl.aps.org/abstract/PRL/v110/i20/e207208.
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