Abstract
We have performed electron spin resonance (ESR) experiments of multiferroic Ca2CoSi2O7 single crystals in high magnetic fields perpendicular to the easy plane. We observed many ESR absorption signals in the magnetization plateau phase below the saturation field which form branches with a linear magnetic field dependence. At zero magnetic field, large energy gaps with Δ = 1.7 ∼ 1.8 THz are identified by linear extrapolations of the resonance branches. We speculate that the high-energy ESR modes would be caused by electromagnons. With increasing magnetic field, some of these ESR modes decrease linearly with field even within the magnetization plateau phase and intersect the zero-frequency line at the magnetic field where the magnetization plateau terminates, suggesting a relationship between these energy gaps and the magnetization plateau.
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