By combining dielectric, specific heat, and magnetization measurements andhigh-resolution neutron powder diffraction, we have investigated thethermodynamic and magnetic/structural properties of the metastable orthorhombicperovskite ErMnO_3 prepared by high-pressure synthesis. The system becomesantiferromagnetically correlated below 42 K and undergoes a lock-in transitionat 28 K with propagation wave vector (0,k_b,0), which remains incommensurate atlow temperature. The intercorrelation between the magnetic structure andelectric properties and the role of the rare earth moment are discussed.
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