LAUSR

Abstract In the orthorhombic (o) RMnO3 compound, it is known that the magnetic state can change from the A-type antiferromagnetic (A-AFM) through a spiral spin order (SSO) into the E-AFM state with the decrease in the R ionic radius (rR). The magnetic phase transition from the E-AFM state to the A-AFM state is expected, but no experimental realization has been reported. In this study, this process in o-Ho1-xGdxMnO3 (x: 0–0.6) is reported. A substitution of Ho with Gd enables the transition of the multiferroic ground state from the E-AFM order (at x ≤ 0.1) to the SSO (at x > 0.4). Accompanied by the quenched disorder, a multiferroic phase separation state is demonstrated in the intermediate composition range of 0.1