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29 March 2024
 
  » arxiv » 0902.2027

 Article overview


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
AbstractThe 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
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