Breaking the geometric magnetic frustration in controlled off-stoichiometric LuMn1+zO3+δ compounds | Zendy

F. Figueiras | Zendy; D. V. Karpinsky | Zendy; Pedro B. Tavares | Zendy; Soma Das | Zendy; José Vieira Leitão | Zendy; E. Brück | Zendy; J. Agostinho Moreira | Zendy; V. S. Amaral | Zendy

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Breaking the geometric magnetic frustration in controlled off-stoichiometric LuMn_1+zO_3+δ compounds

Author(s) -

F. Figueiras,

D. V. Karpinsky,

Pedro B. Tavares,

Soma Das,

José Vieira Leitão,

E. Brück,

J. Agostinho Moreira,

V. S. Amaral

Publication year - 2016

Publication title -

physical chemistry chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.053

H-Index - 239

eISSN - 1463-9084

pISSN - 1463-9076

DOI - 10.1039/c6cp01562j

Subject(s) - frustration , antiferromagnetism , stoichiometry , condensed matter physics , perovskite (structure) , phase (matter) , ferroelectricity , crystallography , materials science , gravimetric analysis , chemistry , spin glass , spin (aerodynamics) , physics , thermodynamics , dielectric , optoelectronics , organic chemistry

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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