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We report on resonant magnetic x-ray scattering and absorption spectroscopystudies of exchange-coupled antiferromagnetic ordering of Eu$^{3+}$ magneticmoments in multiferroic Eu$_{1-x}$Y$_{x}$MnO$_3$ in the absence of an externalmagnetic field. The observed resonant spectrum is characteristic of amagnetically ordered $^7F_1$ state that mirrors the Mn magnetic ordering, dueto exchange coupling between the Eu $4f$ and Mn $3d$ spins. This is the firstobservation of long range magnetic order generated by exchange coupling ofmagnetic moments of formally non-magnetic Van Vleck ions, which is a stepfurther towards the realization of exotic phases induced by exchange couplingin systems entirely composed of non-magnetic ions.

Long range antiferromagnetic order of formally non-magnetic Eu$^{3+}$ Van Vleck ions observed in multiferroic Eu$_{1-x}$Y$_{x}$MnO$_3$