Unveiling complex magnetic structures of the 4 f − 4 d exchange coupled antiferromagnets B a 3 R R u 2 O 9 ( R = Tb , Er )
Year: 2026
Type: article
Abstract: The magnetic structures of B a 3 R R u 2 O 9 ( R = Tb , Er ) have been investigated using high-intensity neutron powder diffraction (NPD) supported by dc and ac susceptibility studies. The NPD data reveal antiferromagnetic (AFM) ground states below T N ∼ 9.8 and 6 K in B a 3 TbR u 2 O 9 and B a 3 ErR u 2 O 9 , respectively, consistent with the magnetic transitions observed in dc and ac susceptibility measurements. In B a 3 TbR u 2 O 9 , the magnetic structure is characterized by a propagation vector, k = ( 0 , 0 , 0 ) , where Tb and Ru order ferromagnetically in the ab plane. Neighboring planes of Tb are coupled antiferromagnetically along the c direction as are neighboring planes of Ru, which leads to an AFM order between Tb and Ru as well. In contrast, the magnetic structure of B a 3 ErR u 2 O 9 is characterized by k = ( 0.5 , 0 , 0 ) , with Er and Ru moments exhibiting a canted AFM ordering. Interestingly, the collinear (noncollinear) AFM order of Tb (Er) accompanied by the collinear (noncollinear) magnetic order of Ru in B a 3 TbR u 2 O 9 ( B a 3 ErR u 2 O 9 ) along with the concurrent ordering of the rare earth and Ru in both compounds suggests a strong coupling between 4 f and 4 d electrons. Both compounds show weak magnetic ordering above
DOI: 10.1103/pbtn-g5wz
Authors: Deepak Garg, C. Ritter, M. Skoulatos, S. Nandi, Yixi Su
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funder: Horizon 2020
OpenAlex ID: W7143597697