Charge ordering and phase competition in the layered perovskite LaSr2Mn2O7

Download
  1. Get@NRC: Charge ordering and phase competition in the layered perovskite LaSr2Mn2O7 (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1103/PhysRevB.61.15269
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titlePhysical Review B
Volume61
Issue22
Pages1526915276; # of pages: 8
AbstractCharge-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
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
NRC publication
This is a non-NRC publication

"Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.

NPARC number12328218
Export citationExport as RIS
Report a correctionReport a correction
Record identifier19647bcd-fd21-46b2-973c-73fd9ee3546c
Record created2009-09-10
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)