Charge ordering and phase competition in the layered perovskite LaSr2Mn2O7

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1103/PhysRevB.61.15269
Author	Search for: Argyriou, D. N.; Search for: Bordallo, H. N.; Search for: Campbell, B. J.; Search for: Cheetham, A. K.; Search for: Cox, D. E.; Search for: Gardner, J. S.; Search for: Hanif, K.; Search for: dos Santos, A.; Search for: Strouse, G. F.
Format	Text, Article
Abstract	Charge-lattice fluctuations are observed in the layered perovskite manganite LaSr2Mn2O7 by Raman spectroscopy at temperatures as high as 340 K, and with decreasing temperature they become static, forming a charge-ordered (CO) phase below TCO=210 K. In the static regime, superlattice reflections are observed by neutron and x-ray diffraction with a propagation vector (1/4, -1/4, 0). Crystallographic analysis of the CO state demonstrates that the degree of charge and orbital ordering in this manganite is weaker than that in the three-dimensional perovskite manganites. Below TN=170 K, type-A antiferromagnetism (AF) develops and competes with the charge ordering, causing it to eventually melt below T*=100 K. High-resolution diffraction measurements suggest that the CO and AF states do not coincide within the same region of material, but rather coexist as separate phases. The transition to type-A antiferromagnetism at lower temperatures is characterized by the competition between these two phases.
Publication date	2000-06-01
In	Physical Review. B, Condensed Matter and Materials Physics 61, no. 22 (1 June 2000): 15269–15276.
Language	English
NRC publication	This is a non-NRC publication "Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.
NPARC number	12328218
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Record identifier	19647bcd-fd21-46b2-973c-73fd9ee3546c
Record created	2009-09-10
Record modified	2020-03-26

Date modified:: 2026-01-23