Charge ordering and phase competition in the layered perovskite
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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.
Originalsprog | Engelsk |
---|---|
Tidsskrift | Physical Review B - Condensed Matter and Materials Physics |
Vol/bind | 61 |
Udgave nummer | 22 |
Sider (fra-til) | 15269-15276 |
Antal sider | 8 |
ISSN | 1098-0121 |
DOI | |
Status | Udgivet - 1 jan. 2000 |
Eksternt udgivet | Ja |
ID: 218269467