Charge and magnetic order in novel layered double perovskites LnBaFe2O6 (Ln = Nd, Y) containing unusually high mixed valence Fe3.5+
This research forms part of a jointly funded EPSRC and JSPS UK-Japan collaborative project. We have used low-temperature topotactic ozone oxidation for A-site layer ordered oxygen deficient LnBaFe2O5 and obtained fully-oxidized double perovskites LnBaFe2O6. The compounds contain unusually high mixed valence Fe3.5+ ions, and are thus expected to show charge transitions to relieve the electronic instability of Fe3.5+. Temperature dependent magnetic susceptibility revealed complicated and successive transitions, e.g. a ferromagnetic-like sharp increase at 320 K, followed by a decrease at about 260 K for NdBaFe2O6. In the proposed NPD experiments, we want to clarify the complicated charge disproportionation/ordering and magnetic transition behaviours of LnBaFe2O6. 2 days on D2B are needed to study 1g Ln = Nd and Y samples over a range of temperatures.
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J. Paul Attfiel;d; ALHARBI Khalid; Midori Amano Patino; GOTO Masato; IIHOSHI Makoto; JI Kunlang; Paula Kayser; Padraig Kearins; RITTER Clemens and SHIMAKAWA YUICHI. (2021). Charge and magnetic order in novel layered double perovskites LnBaFe2O6 (Ln = Nd, Y) containing unusually high mixed valence Fe3.5+. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-238
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