Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet

M. B. Stone; A. Podlesnyak; G. Ehlers; A. Huq; E. C. Samulon; M. C. Shapiro; I. R. Fisher

doi:10.1088/0953-8984/23/41/416003

Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet

Strongly Correlated Electrons 2015-05-20 v1

Authors: M. B. Stone , A. Podlesnyak , G. Ehlers , A. Huq , E. C. Samulon , M. C. Shapiro , I. R. Fisher

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Abstract

We present inelastic neutron scattering and thermodynamic measurements characterizing the magnetic excitations in a disordered non-magnetic substituted spin-liquid antiferromagnet. The parent compound Ba3Mn2O8 is a dimerized, quasi-two-dimensional geometrically frustrated quantum disordered antiferromagnet. We substitute this compound with non-magnetic vanadium for the S = 1 manganese atoms, Ba3(Mn1-xVx)2O8, and find that the singlet-triplet excitations which dominate the spectrum of the parent compound persist for the full range of substitution examined, x = 0.02 to 0.3. We also observe additional low-energy magnetic fluctuations which are enhanced at the greatest substitution values. These excitations may be a precursor to a low-temperature random singlet phase which may exist in Ba3(Mn1-xVx)2O8

Keywords

magnons site dilution dimerized antiferromagnet geometrical frustration spin liquid inelastic neutron scattering singlet-triplet excitations random singlet phase

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@article{arxiv.1012.0099,
  title  = {Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet},
  author = {M. B. Stone and A. Podlesnyak and G. Ehlers and A. Huq and E. C. Samulon and M. C. Shapiro and I. R. Fisher},
  journal= {arXiv preprint arXiv:1012.0099},
  year   = {2015}
}

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30 pages, 9 figures

Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet

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