Charge ordering and phase competition in the layered perovskite
Research output: Contribution to journal › Journal article › Research › peer-review
Charge-lattice fluctuations are observed in the layered perovskite manganite (Formula presented) by Raman spectroscopy at temperatures as high as 340 K, and with decreasing temperature they become static, forming a charge-ordered (CO) phase below (Formula presented) 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 (Formula presented) type-A antiferromagnetism (AF) develops and competes with the charge ordering, causing it to eventually melt below (Formula presented) 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.
Original language | English |
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Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 61 |
Issue number | 22 |
Pages (from-to) | 15269-15276 |
Number of pages | 8 |
ISSN | 1098-0121 |
DOIs | |
Publication status | Published - 1 Jan 2000 |
Externally published | Yes |
ID: 218269467