Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9

J. A. Quilliam; F. Bert; E. Kermarrec; C. Payen; C. Guillot-Deudon; P. Bonville; C. Baines; H. Luetkens; P. Mendels

doi:10.1103/PhysRevLett.109.117203

Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9

Strongly Correlated Electrons 2015-06-05 v1

Authors: J. A. Quilliam , F. Bert , E. Kermarrec , C. Payen , C. Guillot-Deudon , P. Bonville , C. Baines , H. Luetkens , P. Mendels

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Abstract

We present local probe results on the honeycomb lattice antiferromagnet Ba3CuSb2O9. Muon spin relaxation measurements in 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.

Keywords

quantum antiferromagnet Ba3CuSb2O9 honeycomb lattice muon spin relaxation NMR spin freezing gapped magnetic excitations singlet ground state

Cite

@article{arxiv.1207.6469,
  title  = {Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9},
  author = {J. A. Quilliam and F. Bert and E. Kermarrec and C. Payen and C. Guillot-Deudon and P. Bonville and C. Baines and H. Luetkens and P. Mendels},
  journal= {arXiv preprint arXiv:1207.6469},
  year   = {2015}
}

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Accepted for publication in Physical Review Letters

Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9

Abstract

Keywords

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