Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

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

arxiv: cond-mat/0301546 · v1 · submitted 2003-01-28 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

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

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T. Goto M. Johnsson P. Millet

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classification ❄️ cond-mat.str-el cond-mat.mtrl-sci

keywords criticalityquantumcu2te2o5br2energylongitudinalmagneticmagnonnear

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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.

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Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

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