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; J. C. Orain; F. Bert; A. de Vries; F. H. Aidoudi; R. E. Morris; P. Lightfoot; J. S. Lord; M. T. F. Telling; P. Bonville; P. Attfield; P. Mendels; A. Harrison

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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Journal articles

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Physics [physics]

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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 ]

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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 ]

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