Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

C. Gros; P. Lemmens; M. Vojta; R. Valenti; K. -Y. Choi; H. Kageyama; Z. Hiroi; N. V. Mushnikov; T. Goto; M. Johnsson; P. Millet

doi:10.1103/PhysRevB.67.174405

Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

Strongly Correlated Electrons 2009-11-10 v1 Materials Science

Authors: C. Gros , P. Lemmens , M. Vojta , R. Valenti , K. -Y. Choi , H. Kageyama , Z. Hiroi , N. V. Mushnikov , T. Goto , M. Johnsson , P. Millet

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Abstract

We present a comprehensive study of the coupled tetrahedra-compound Cu2Te2O5Br2 by theory and experiments in external magnetic fields. We report the observation of a longitudinal magnon in Raman scattering in the ordered state close to quantum criticality. We show that the excited tetrahedral-singlet sets the energy scale for the magnetic ordering temperature T_N. This energy is determined experimentally. The ordering temperature T_N has an inverse-log dependence on the coupling parameters near quantum criticality.

Keywords

longitudinal magnon quantum criticality tetrahedral spin system Raman scattering magnetic ordering temperature Cu2Te2O5Br2

Cite

@article{arxiv.cond-mat/0301546,
  title  = {Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality},
  author = {C. Gros and P. Lemmens and M. Vojta and R. Valenti and K. -Y. Choi and H. Kageyama and Z. Hiroi and N. V. Mushnikov and T. Goto and M. Johnsson and P. Millet},
  journal= {arXiv preprint arXiv:cond-mat/0301546},
  year   = {2009}
}

Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

Abstract

Keywords

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