Breaking the geometric magnetic frustration in controlled off-stoichiometric LuMn1+zO3+δ compounds
F G Figueiras1, D Karpinsky2, P B Tavares3
1Physics Department & CICECO-AIM, Aveiro University, 3810-193 Aveiro, Portugal. ffigueiras@ua.pt and IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Physics and Astronomy Department, Faculty of Sciences of University of Porto, 4169-007 Porto, Portugal.
Abstract:
This study explores controlled off-stoichiometric LuMn1+zO3+δ (|z| < 0.1) compounds, intended to retain the utter LuMnO3 intrinsic hexagonal symmetry and ferroelectric properties. X-ray powder diffraction measurements evidenced a single phase P63cm structure. Thermo-gravimetric experiments show a narrow impact of oxygen vacancies while a distinguishable gas exchange at ∼700 K, a surprisingly lower temperature when compared to perovskite systems. A comparison of different nominal ceramics revealed pertinent structural and magnetic property variations owing to subtle self-doping effects. Deviations from the archetypal antiferromagnetic state were detected below ∼90 K suggesting local rearrangements of the nominal Mn(3+) ions matrix, breaking the ideal geometrical spin frustration, leading to a non-compensated magnetic structure.
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