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29 March 2024 |
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Article overview
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Manganite charge and orbitally ordered and disordered states probed by Fe substitution into Mn site in LnBaMn1.96Fe0.04O5, LnBaMn1.96Fe0.04O6 and LnBaMn1.96Fe0.04O5.5 (Ln=Y, Gd, Sm, Nd, Pr, La) | A. I. Rykov
; Y. Ueda
; K. Nomura
; | Date: |
12 Feb 2009 | Abstract: | The layered manganese oxides LnBaMn1.96Fe0.04Oy (Ln=Y, Gd, Sm, Nd, Pr, La)
have been synthesized for y=5, 5.5 and 6. In oxygen-saturated state $(y=6)$
they exhibit the charge and orbital order at ambient temperature for Ln=Y, Gd,
Sm, but unordered $e_{g} $-electronic system for Ln=La,Pr,Nd. Fourfould
increase of quadrupole splitting was observed in charge and orbitally ordered
manganites compared to unordered ones. This is in agreement with the jumplike
increase of distortion of reduced perovskite-like cell in the charge and
orbitally ordered structures. Substitution of 2 percent of Mn by Fe suppresses
the temperatures of structural and magnetic transitions by 20 to 50 K.
Parameters of crystal lattices and room-temperature Moessbauer spectra were
studied on fourty samples whose structures were refined within five symmetry
groups: P4/mmm, P4/nmm, Pm-3m, Icma and P2. Overwhelming majority of Fe species
are undifferentiated by the Mossbauer parameters except special cases. The
single-component spectra in two-site structures are explained by preference of
Fe towards the site of Mn(III) and by segmentation of charge and orbitally
ordered domains. | Source: | arXiv, 0902.2027 | Services: | Forum | Review | PDF | Favorites |
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