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Phase diagram of the orthorhombic, lightly lutetium doped EuMnO 3 magnetoelectric system

Abstract : This paper reports on structural, magnetic, dielectric, thermodynamic, and magnetodielectric properties of Eu1−xLuxMnO3, with 0 ⩽ x ⩽ 0.2, towards the (x, T) phase diagram. The phase diagram reflects the effect of lattice distortions induced by the isovalent substitution of Eu3+ by smaller Lu3+ ions, which gradually unbalances the antiferromagnetic against the ferromagnetic exchange interactions, enabling the emergence of both ferroelectricity and magnetoelectric coupling. For x < 0.1, the paramagnetic phase is followed by a presumably incommensurate collinear antiferromagnetic phase AFM-1, and then a weak ferromagnetic phase seems to be established, with a canted A-type antiferromagnetic order. For 0.1 ⩽ x ⩽ 0.2, the AFM-1 phase is followed by an antiferromagnetic phase AFM-2 with modulated spiral spin arrangement, compatible with ferroelectricity. The disappearance of hysteresis cycles P(E) at low temperatures, clearly indicates the existence of an antiferromagnetic phase AFM-3, whose spin structure is not compatible with both the ferroelectric and ferromagnetic components. The magnetic behavior of EuMnO3 and Eu0.9Lu0.1MnO3 suggests the existence of a phase line separating the AFM-1 phase from the AFM-2 and AFM-3 phases, which is observed for x = 0.1. Magnetodielectric coupling was evidenced for both x = 0.1 and 0.2 compositions. Ferroelectric polarization and magnetodielectric coupling coefficient are larger for the latter composition.
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Submitted on : Thursday, January 27, 2022 - 10:57:09 AM
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Wilfrid Prellier, J. Oliveira, J. Agostinho Moreira, A. Almeida, M. Chaves, et al.. Phase diagram of the orthorhombic, lightly lutetium doped EuMnO 3 magnetoelectric system. Physical Review B, 2011, 84 (9), pp.094414. ⟨10.1103/PhysRevB.84.094414⟩. ⟨hal-03545325⟩



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