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Modulated charge ordering process in Sm_0.5Ca_0.5Mn_1–xCr_xO₃ manganites

Content Provider	Royal Society of Chemistry (RSC)
Author	Hervieu, M. Maignan, A. Martin, C. Barnabé, A. Raveau, B.
Copyright Year	1998
Abstract	The oxides Sm0.5Ca0.5Mn1–xCrxO3 , with 0≤x≤0.07, have been studied by electron diffraction and electron microscopy versustemperature from 90 K to 300 K, in connection with their magnetic and transport properties. An incommensurate charge ordering appears atTCO=275 K for the undoped compound, then a progressive transition from an incommensurate to a commensurate modulated structure is observed as Tdecreases from 275 K to 170 K. But the most important point is that chromium doping enhances the incommensurability of the structure: theq vector of the low temperature form decreases and TCO decreases abruptly as the chromium content x increases, so that the charge ordering process is weakened and finally disappears for x=0.05. The structure of the low temperature form of these manganites is characterized by a double supercell, 2ap √2×2ap ×ap √2, similar to that observed for other Ln0.5Ca0.5MnO3 manganites with Ln=La, Pr, Nd, Tb. However, in these series, one observes similar space groups (P2mmorPmmm) for Ln=Nd, Sm, different from those observed for Ln=La, Tb.
Starting Page	1405
Ending Page	1411
Page Count	7
File Format	PDF
ISSN	09599428
Volume Number	8
Issue Number	6
Journal	Journal of Materials Chemistry
DOI	10.1039/a800994e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TCO Tb Electron diffraction Transmission electron microscopy Charge ordering Chromium Dopant Euclidean vector Supercell
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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