TY  - JOUR
AU  - Li, H.-F.
AU  - Su, Y.
AU  - Chatterji, T.
AU  - Nefedov, A.
AU  - Persson, J.
AU  - Meuffels, P.
AU  - Xiao, Y.
AU  - Vaknin, D.
AU  - Brückel, T.
TI  - Soft x-ray resonant scattering study of single-crystal LaSr2Mn2O7
JO  - The European physical journal / B
VL  - 74
SN  - 1434-6028
CY  - Berlin
PB  - Springer
M1  - PreJuSER-9413
SP  - 457 - 461
PY  - 2010
N1  - We are grateful for the excellent technical support from BESSY-II, Germany. This work was partially supported by the BMBF under contract No. O3ZA6BC2.
AB  - Soft X-ray resonant scattering studies at the Mn L-II,L- III- and the La M-IV,M- V- edges of single-crystal LaSr2Mn2O7 are reported. At low temperatures, below T-N a parts per thousand 160 K, energy scans with a fixed momentum transfer at the A-type antiferromagnetic (0 0 1) reflection around the Mn L-II,L- III-edges with incident linear sigma and pi polarizations show strong resonant enhancements. The splitting of the energy spectra around the Mn L-II,L- III-edges may indicate the presence of a mixed valence state, e.g., Mn3+/Mn4+. The relative intensities of the resonance and the clear shoulder-feature as well as the strong incident sigma and pi polarization dependences strongly indicate its complex electronic origin. Unexpected enhancement of the charge Bragg (0 0 2) reflection at the La M-IV,M- V-edges with sigma polarization has been observed up to 300 K, with an anomaly appearing around the orbital-ordering transition temperature, T-OO a parts per thousand 220 K, suggesting a strong coupling (competition) between them.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000276900000005
DO  - DOI:10.1140/epjb/e2010-00117-3
UR  - https://juser.fz-juelich.de/record/9413
ER  -