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 ]

L. Clark 1 J. C. Orain 2 F. Bert 2 A. de Vries 1 F. H. Aidoudi 3 R. E. Morris 3 P. Lightfoot 3 J. S. Lord 4 M. T. F. Telling 4 P. Bonville 5 P. Attfield 1 P. Mendels 6, 2 A. Harrison 7, 1
1 University of Edinburgh
2 LPS - Laboratoire de Physique des Solides d'Orsay
3 School of Chemistry, University of St Andrews
4 ISIS Facility
5 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
6 IUF - Institut Universitaire de France
7 ILL - Institut Laue-Langevin
Abstract : The vanadium oxyfluoride [NH(4)](2)[C(7)H(14)N][V(7)O(6)F(18)] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S = 1/2 kagome planes of V(4+) d(1) ions with S = 1 V(3+) d(2) 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 V(3+) 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.
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L. Clark, J. C. Orain, F. Bert, A. de Vries, F. H. Aidoudi, et al.. 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, American Physical Society, 2013, 110 (20), ⟨10.1103/PhysRevLett.110.207208⟩. ⟨cea-01477926⟩

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