Mutual induction of magnetic 3d and 4f order in multiferroic hexagonal ErMnO3

Article

关键词: PHASE-DIAGRAMS;    RMNO3 R;    YB;    ER;   

DOI  :  10.1103/PhysRevB.86.184415

来源: SCIE

【 摘 要 】

The complex interplay between the 3d and 4f moments in hexagonal ErMnO3 is investigated by magnetization, optical second harmonic generation, and neutron-diffraction measurements. We revise the phase diagram and provide a microscopic model for the emergent spin structures, with a special focus on the intermediary phase transitions. Our measurements reveal that the 3d exchange between Mn3+ ions dominates the magnetic symmetry at 10 K < T < T-N with Mn3+ order according to the Gamma(4) representation triggering 4f ordering according to the same representation on the Er3+(4b) site. Below 10 K the magnetic order is governed by 4f exchange interactions of Er3+ ions on the 2a site. The magnetic Er3+(2a) order according to the representation Gamma(2) induces a magnetic reorientation (Gamma(4) -> Gamma(2)) at the Er3+(4b) and the Mn3+ sites. Our findings highlight the fundamentally different roles that Mn3+, R3+(2a), and R3+(4b) magnetism play in establishing the magnetic phase diagram of the hexagonal RMnO3 system.

【 授权许可】

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