Spin reorientation and the interplay of magnetic sublattices in Er2CuMnMn4O12

DOI: 10.1107/S2052520624008965

Authors: John M. Attah-Baah (University College London; University of Sergipe) , Dmitry D. Khalyavin (ISIS Facility) , Pascal Manuel (ISIS Facility) , Nilson S. Ferreira (Federal University of Sergipe) , Alexei A. Belik (National Institute for Materials Science (NIMS)) , Roger D. Johnson (University College London; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Crystallographica Section B Structural Science, Crystal Engineering And Materials , VOL 80

State: Published (Approved)
Published: December 2024

Abstract: Through a combination of magnetic susceptibility, specific heat, and neutron powder diffraction measurements we have revealed a sequence of four magnetic phase transitions in the columnar quadruple perovskite Er2CuMnMn4O12. A key feature of the quadruple perovskite structural framework is the complex interplay of multiple magnetic sublattices via frustrated exchange topologies and competing magnetic anisotropies. It is shown that in Er2CuMnMn4O12, this phenomenology gives rise to multiple spin-reorientation transitions driven by the competition of easy-axis single ion anisotropy and the Dzyaloshinskii–Moriya interaction; both within the manganese B-site sublattice. At low temperature, one Er sublattice orders due to a finite f-d exchange field aligned parallel to its Ising axis, while the other Er sublattice remains non-magnetic until a final, symmetry-breaking phase transition into the ground state. This non-trivial low-temperature interplay of transition metal and rare-earth sublattices, as well as an observed k = (0, 0, ½) periodicity in both manganese spin canting and Er ordering, raises future challenges to develop a complete understanding of the R2CuMnMn4O12 family.

Journal Keywords: columnar perovskites; ferrimagnetism; spin reorientation; magnetic frustration.

Subject Areas: Materials, Physics


Technical Areas:

Added On: 31/10/2024 11:46

Discipline Tags:

Physics Magnetism Materials Science Perovskites Metallurgy

Technical Tags: