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2017 ; 8
(1
): 500
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Molecular analogue of the perovskite repeating unit and evidence for direct
Mn(III)-Ce(IV)-Mn(III) exchange coupling pathway
#MMPMID28894086
Thuijs AE
; Li XG
; Wang YP
; Abboud KA
; Zhang XG
; Cheng HP
; Christou G
Nat Commun
2017[Sep]; 8
(1
): 500
PMID28894086
show ga
The perovskite manganites AMnO(3) and their doped analogues A(1-x) B (x) MnO(3)
(A and B?=?main group and lanthanide metals) are a fascinating family of magnetic
oxides exhibiting a rich variety of properties. They are thus under intense
investigation along multiple fronts, one of which is how their structural and
physical properties are modified at the nanoscale. Here we show that the
molecular compound [Ce(3)Mn(8)O(8)(O(2)CPh)(18)(HO(2)CPh)(2)]
(Ce(III)(2)Ce(IV)Mn(III)(8); hereafter Ce(3)Mn(8)) bears a striking structural
resemblance to the repeating unit seen in the perovskite manganites. Further,
magnetic studies have established that Ce(3)Mn(8) exhibits both the combination
of pairwise Mn(III)(2) ferromagnetic and antiferromagnetic exchange interactions,
and the resultant spin vector alignments that are found within the 3-D C-type
antiferromagnetic perovskites. First-principles theoretical calculations reveal
not only the expected nearest-neighbor Mn(III)(2) exchange couplings via
superexchange pathways through bridging ligands but also an unusual, direct
Mn(III)-Ce(IV)-Mn(III) metal-to-metal channel involving the Ce(IV) f
orbitals.Perovskite manganites exhibit intriguing but poorly understood
properties, including multiferroicity. Here, the authors synthesize a Ce(3)Mn(8)
cluster that structurally resembles a perovskite repeat unit, and use this
molecular analogue to elucidate mechanisms driving bulk perovskite properties.