Structure and charge-ordering transition in Bi-based bilayered Bi0.44Ca2.56Mn2O7 manganite - art. no. 144108

Authors
Qin, YL Garcia-Munoz, JL Zandbergen, HW Alonso, JA
Citation
Yl. Qin et al., Structure and charge-ordering transition in Bi-based bilayered Bi0.44Ca2.56Mn2O7 manganite - art. no. 144108, PHYS REV B, 6314(14), 2001, pp. 4108
Citations number
32
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6314
Issue
14
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010401)6314:14<4108:SACTIB>2.0.ZU;2-P
Abstract
The normal and charge-ordered phases in Bi2-2xCa1+2xMn2O7 With a hole-dopin g level of x = 0.78 have been investigated by transmission electron microsc opy. Bio(0.44)Ca(2.56)Mn(2)O(7), the first identified member of the 327-typ e Bi-Ca-Mn-O family, was obtained under high oxygen pressure, and presents an orthorhombic structure with Amam symmetry at room temperature. A structu ral modulation is observed in this unusual layered manganite below 210 K, c haracterized by the one-dimensional wave vector q = 0.22b* and a single tra nsverse component. At low temperature the superspace group of the charge or dered state is P-s-11(Amam).