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We report on neutron diffraction, thermal expansion, magnetostriction,dielectric, and specific heat measurements on polycrystalline FeCr2S4 inexternal magnetic fields. The ferrimagnetic ordering temperatures$T_{\mathrm{C}}\approx 170$ K and the transition at $T_{\mathrm{OO}}\approx 10$K, which has been associated with orbital ordering, are only weakly shifted inmagnetic fields up to 9 T. The cubic lattice parameter is found to decreasewhen entering the state below $T_{\mathrm{OO}}$. The magnetic moments of theCr- and Fe-ions are reduced from the spin-only values throughout themagnetically ordered regime, but approach the spin-only values for fields$>$5.5 T. Thermal expansion in magnetic fields and magnetostriction experimentsindicate a contraction of the sample below about 60 K. Below $T_{\mathrm{OO}}$this contraction is followed by a moderate expansion of the sample for fieldslarger than $\sim$4.5 T. The transition at $T_{\mathrm{OO}}$ is accompanied byan anomaly in the dielectric constant. The dielectric constant depends on boththe strength and orientation of the external magnetic field with respect to theapplied electric field for $T<T_{\mathrm{OO}}$. A linear correlation of themagnetic-field-induced change of the dielectric constant and the magnetic-fielddependent magnetization is observed. This behaviour is consistent with theexistence of a ferroelectric polarization and a multiferroic ground state below10 K.

FeCr$_2$S$_4$ in magnetic fields: possible evidence for a multiferroic ground state