Spin-Triplet Excitons in the $S=1/2$ Gapped Antiferromagnet BaCuSi$_2$O$_6$: Electron Paramagnetic Resonance Studies

S. A. Zvyagin; J. Wosnitza; J. Krzystek; R. Stern; M. Jaime; Y. Sasago; K. Uchinokura

doi:10.1103/PHYSREVB.73.094446

Spin-Triplet Excitons in the $S=1/2$ Gapped Antiferromagnet BaCuSi$_2$O$_6$: Electron Paramagnetic Resonance Studies

Other Condensed Matter 2019-09-20 v1 Materials Science

Authors: S. A. Zvyagin , J. Wosnitza , J. Krzystek , R. Stern , M. Jaime , Y. Sasago , K. Uchinokura

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Abstract

BaCuSi $_2$ O $_6$ , a $S=1/2$ quantum antiferromagnet with a double-layer structure of Cu $^{2+}$ ions in a distorted planar-rectangular coordination and with a dimerized spin singlet ground state, is studied by means of the electron paramagnetic resonance technique. It is argued that multiple absorptions observed at low temperatures are intimately related to a thermally-activated spin-triplet exciton superstructure. Analysis of the angular dependence of exciton modes in BaCuSi $_2$ O $_6$ allows us to accurately estimate anisotropy parameters. In addition, the temperature dependence of EPR intensity and linewidth is discussed.

Keywords

spin-triplet excitons quantum antiferromagnet electron paramagnetic resonance anisotropy parameters BaCuSi2O6

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@article{arxiv.cond-mat/0601017,
  title  = {Spin-Triplet Excitons in the $S=1/2$ Gapped Antiferromagnet BaCuSi$_2$O$_6$: Electron Paramagnetic Resonance Studies},
  author = {S. A. Zvyagin and J. Wosnitza and J. Krzystek and R. Stern and M. Jaime and Y. Sasago and K. Uchinokura},
  journal= {arXiv preprint arXiv:cond-mat/0601017},
  year   = {2019}
}

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Submitted to Phys. Rev. B

Spin-Triplet Excitons in the $S=1/2$ Gapped Antiferromagnet BaCuSi$_2$O$_6$: Electron Paramagnetic Resonance Studies

Abstract

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