TY - JOUR
T1 - Charge disproportionation and magnetoresistivity in a double perovskite with alternate Fe4+(d4) and Mn4+(d3) layers
AU - Ganesanpotti, Subodh
AU - Tassel, Cédric
AU - Hayashi, Naoaki
AU - Goto, Yoshihiro
AU - Bouilly, Guillaume
AU - Yajima, Takeshi
AU - Kobayashi, Yoji
AU - Kageyama, Hiroshi
N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13
PY - 2014/1/1
Y1 - 2014/1/1
N2 - An oxygen-stoichiometric, B-site-ordered perovskite Ca2Fe 1.1Mn0.9O6 (CFMO) with alternate stacking of Fe and Mn layers was obtained through topochemical oxidation of the corresponding brownmillerite phase under high pressure in the presence of KClO4. The structure crystallizes in the P21/m space group with a doubling of the cell along all three crystallographic axes. Mössbauer spectroscopy, susceptibility, and resistivity measurements suggest ferromagnetic interactions between Fe4+(d4) and Mn4+(d3) along [001] through a double-exchange mechanism, a situation similar to half-doped manganese perovskite oxides. Upon cooling, CFMO exhibits a ferrimagnetic transition below Tc = 90 K, likely accompanied by a charge disproportionation of the iron site, 2Fe4+rarr; Fe3+ + Fe5+. A reasonably good magnetoresistivity of 27 % was observed below Tc. High-pressure oxygen intercalation of a brownmillerite phase Ca2Fe1.1Mn0.9O5 provides a fully oxidized layered double perovskite Ca2Fe1.1Mn 0.9O6 with alternate Fe4+(d4) and Mn4+(d3) layers. Ca2Fe1.1Mn 0.9O6 exhibits charge disproportionation and magneto-resistivity. Electron hopping through double-exchange ferromagnetic interactions between Fe4+ and Mn4+ is proposed. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
AB - An oxygen-stoichiometric, B-site-ordered perovskite Ca2Fe 1.1Mn0.9O6 (CFMO) with alternate stacking of Fe and Mn layers was obtained through topochemical oxidation of the corresponding brownmillerite phase under high pressure in the presence of KClO4. The structure crystallizes in the P21/m space group with a doubling of the cell along all three crystallographic axes. Mössbauer spectroscopy, susceptibility, and resistivity measurements suggest ferromagnetic interactions between Fe4+(d4) and Mn4+(d3) along [001] through a double-exchange mechanism, a situation similar to half-doped manganese perovskite oxides. Upon cooling, CFMO exhibits a ferrimagnetic transition below Tc = 90 K, likely accompanied by a charge disproportionation of the iron site, 2Fe4+rarr; Fe3+ + Fe5+. A reasonably good magnetoresistivity of 27 % was observed below Tc. High-pressure oxygen intercalation of a brownmillerite phase Ca2Fe1.1Mn0.9O5 provides a fully oxidized layered double perovskite Ca2Fe1.1Mn 0.9O6 with alternate Fe4+(d4) and Mn4+(d3) layers. Ca2Fe1.1Mn 0.9O6 exhibits charge disproportionation and magneto-resistivity. Electron hopping through double-exchange ferromagnetic interactions between Fe4+ and Mn4+ is proposed. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
UR - https://onlinelibrary.wiley.com/doi/10.1002/ejic.201402009
UR - http://www.scopus.com/inward/record.url?scp=84901232467&partnerID=8YFLogxK
U2 - 10.1002/ejic.201402009
DO - 10.1002/ejic.201402009
M3 - Article
SN - 1099-0682
SP - 2576
EP - 2581
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 15
ER -