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Charge Ordering and Phase Competition in the Layered Perovskite Lasr2mn2o7 by Argyriou, D. N; Bordallo1, H. N.; Campbell, B. J.; Cheetham, A. K.; Cox, D. E.; Gardner, J. S.; Hanif, K.; Santos, A. dos; Strouse, G. F. is a scholarly article available to read on EtoBox.

What is Charge Ordering and Phase Competition in the Layered Perovskite Lasr2mn2o7 about?

Charge-lattice fluctuations are observed in the layered perovskite manganite LaSr2Mn2O7 by Raman spectroscopy as high as 340 K and with decreasing temperature they become static and form a charge ordered (CO) phase below TCO=210 K. In the static regime, superlattice reflections are observed through neutron and x-ray diffraction with a propagation vector (h+1/4,k-1/4,l). Crystallographic analysis of the CO state demonstrates that the degree of charge and orbital ordering in this manganite is weaker than the charge ordering in three dimensional perovskite manganites. A TN=170K a type-A antiferromagnetism (AF) develops and competes with the charge ordering, that eventually melts below T*=100K. High resolution diffraction measurements suggest that that CO- and AF-states do not coincide within the same region in the material but rather co-exist as separate phases. The transition to type-A antiferromagnetism at lower temperatures is characterized by the competition between these two phases.

Author

Argyriou, D. N; Bordallo1, H. N.; Campbell, B. J.; Cheetham, A. K.; Cox, D. E.; Gardner, J. S.; Hanif, K.; Santos, A. dos; Strouse, G. F.

Published

1999

Language

EN