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The coexisting magnetic and ferroelectric orders in multiferroic materialsgive rise to a handful of novel magnetoelectric phenomena, such as theabsorption difference for the opposite propagation directions of light calledthe non-reciprocal directional dichroism (NDD). Usually these effects arerestricted to low temperature, where the multiferroic phase develops. In thispaper we report the observation of NDD in the paramagnetic phase of Sr2CoSi2O7up to temperatures more than ten times higher than its N\'eel temperature (7 K)and in fields up to 30 T. The magnetically induced polarization and NDD in thedisordered paramagnetic phase is readily explained by the single-ionspin-dependent hybridization mechanism, which does not necessitate correlationeffects between magnetic ions. The Sr2CoSi2O7 provides an ideal system for atheoretical case study, demonstrating the concept of magnetoelectric spinexcitations in a paramagnet via analytical as well as numerical approaches. Weapplied exact diagonalization of a spin cluster to map out the temperature andfield dependence of the spin excitations, as well as symmetry arguments of thesingle ion and lattice problem to get the spectrum and selection rules.

Directional dichroism in the paramagnetic state of multiferroics: a case study of infrared light absorption in Sr2CoSi2O7 at high temperatures