Crystal structure and magnetic ground state of novel Mn3MnTa2O9 high pressure triple perovskite.
Ambient pressure Mn4Nb2O9 and Mn4Ta2O9 are well known multiferroic materials. The high pressure (HP) modification of Mn4Nb2O9 (Mn3MnNb2O9) crystallises with a triple perovskite (TPv) structure, with A sites occupied by Mn2+ and B sites by perfectly 1:2 ordered Mn:Nb, thus notable as the first A-site manganite with TPv structure. Three transitions at TN = 52 K, TR = 29 K and TL = 4.2 K are observed for Mn3MnNb2O9 from magnetic susceptibility and heat capacity data. D20 NPD data revealed the spins align into a colinear AFM structure at TN, modulate below TR into a complex SDW with kR = [kx 0 kz] continuously evolving down to a locked phase with kL = [¿ 0 -¿]. HP Mn3MnTa2O9 crystallises with isostructural TPv (S.G. Cc, a = 9.92(1)Å, b = 5.33(1)Å, c = 13.24(1)Å and ß = 92.8(1)°). Magnetic susceptibility shows three transitions at 52.6 K, 30.9 K and 22.8 K, presumably alike those of the Nb analogue. Only the two first are observed from heat capacity, suggesting a different nature of the third one. A D20 long scan is requested on Mn3MnTa2O9 at 300 K using ¿ = 1.59 Å for accurate structural determination and a low temperature scan using ¿ = 2.41 Å to confirm the magnetic ground state.
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Elena Solana-Madruga and RITTER Clemens. (2021). Crystal structure and magnetic ground state of novel Mn3MnTa2O9 high pressure triple perovskite.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-858
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