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
TL;DR
This paper investigates the magnetic excitations in Cu2Te2O5Br2 near quantum criticality, revealing a longitudinal magnon via Raman scattering and analyzing the relationship between tetrahedral singlet states and magnetic ordering.
Contribution
It provides the first experimental observation of a longitudinal magnon in this compound and links the ordering temperature to tetrahedral singlet energies near quantum criticality.
Findings
Observation of a longitudinal magnon in Raman scattering.
The tetrahedral singlet sets the energy scale for T_N.
T_N exhibits inverse-log dependence on coupling parameters.
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.
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