Singlet ground state of the quantum antiferromagnet Ba(3)CuSb(2)O(9)

We present local probe results on the honeycomb lattice antiferromagnet Ba(3)CuSb(2)O(9). Muon spin relaxation measurements in a zero field down to 20 mK show unequivocally that there is a total absence of spin freezing in the ground state. Sb NMR measurements allow us to track the intrinsic suscept...

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Bibliographic Details
Published in:Physical review letters 2012-09, Vol.109 (11), p.117203-117203
Main Authors: Quilliam, J A, Bert, F, Kermarrec, E, Payen, C, Guillot-Deudon, C, Bonville, P, Baines, C, Luetkens, H, Mendels, P
Format: Article
Language:English
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Summary:We present local probe results on the honeycomb lattice antiferromagnet Ba(3)CuSb(2)O(9). Muon spin relaxation measurements in a zero field down to 20 mK show unequivocally that there is a total absence of spin freezing in the ground state. Sb NMR measurements allow us to track the intrinsic susceptibility of the lattice, which shows a maximum at around 55 K and drops to zero in the low-temperature limit. The spin-lattice relaxation rate shows two characteristic energy scales, including a field-dependent crossover to exponential low-temperature behavior, implying gapped magnetic excitations.
ISSN:1079-7114