Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

Details Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

2003-01-28

arxiv.org/abs/cond-mat/0301546v1

PRB, Vol. 67, 174405 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.67.174405

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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