Breaking the geometric magnetic frustration in controlled off-stoichiometric LuMn1+zO3+delta compounds

authors	Figueiras, FG; Karpinsky, D; Tavares, PB; Das, S; Leitao, JV; Bruck, EH; Moreira, JA; Amaral, VS
nationality	International
journal	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords	MULTIFERROIC HEXAGONAL MANGANITES; PEROVSKITES; LUMNO3; LU; DY; FERROELECTRICITY
abstract	This study explores controlled off-stoichiometric LuMn1+zO3+delta (vertical bar z vertical bar < 0.1) compounds, intended to retain the utter LuMnO3 intrinsic hexagonal symmetry and ferroelectric properties. X-ray powder diffraction measurements evidenced a single phase P6(3)cm structure. Thermo-gravimetric experiments show a narrow impact of oxygen vacancies while a distinguishable gas exchange at similar to 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 similar to 90 K suggesting local rearrangements of the nominal Mn3+ ions matrix, breaking the ideal geometrical spin frustration, leading to a non-compensated magnetic structure.
publisher	ROYAL SOC CHEMISTRY
issn	1463-9076
year published	2016
volume	18
issue	19
beginning page	13519
ending page	13523
digital object identifier (doi)	10.1039/c6cp01562j
web of science category	Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category	Chemistry; Physics
unique article identifier	WOS:000376138000042