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29 March 2024
 
  » arxiv » 1208.1316

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Mutual induction of magnetic 3d and 4f order in multiferroic hexagonal ErMnO3
D. Meier ; H. Ryll ; K. Kiefer ; B. Klemke ; J.-U. Hoffmann ; R. Ramesh ; M. Fiebig ;
Date Tue, 7 Aug 2012 01:32:39 GMT (1853kb)
AbstractThe 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 Mn^{3+} ions dominates the magnetic symmetry at 10 K < T < T_N with Mn^3+ order according to the Gamma_4 representation triggering 4f ordering according to the same representation on the Er^{3+}(4b) site. Below 10 K the magnetic order is governed by 4f exchange interactions of Er^{3+} ions on the 2a site. The magnetic Er^{3+}(2a) order according to the representation Gamma_2 induces a magnetic reorientation (Gamma_4 --> Gamma_2) at the Er^{3+}(4b) and the Mn^{3+} sites. Our findings highlight the fundamentally different roles the Mn^{3+}, R^{3+}(2a), and R^{3+}(4b) magnetism play in establishing the magnetic phase diagram of the hexagonal RMnO3 system.
Source arXiv, 1208.1316
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