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A low‐energy collective excitation mode in charge‐ordered multiferroic LuFe2O4 is reported via terahertz time‐domain spectroscopy. Upon cooling from 300 to 40 K, the central resonance frequency showed a pronounced hardening from 0.85 to 1.15 THz. In analogy to the well‐known low‐energy optical properties of LuFe2O4, this emerging resonance was attributed to the charge–density–wave (CDW) collective...
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