Phys. Rev. Lett. 94, 147206 (2005) [4 pages]Lamellar Phase Separation and Dynamic Competition in La0.23Ca0.77MnO3Received 10 September 2004; published 14 April 2005 We report the coexistence of lamellar charge-ordered (CO) and charge-disordered (CD) domains, and their dynamical behavior, in La0.23Ca0.77MnO3. Using high-resolution transmission electron microscopy (TEM), we show that below TCD∼170 K a CD-monoclinic phase forms within the established CO-orthorhombic matrix. The CD phase has a sheetlike morphology, perpendicular to the q vector of the CO superlattice (a axis of the Pnma structure). For temperatures between 64 and 130 K, both the TEM and resistivity experiments show a dynamic competition between the two phases: at constant T, the CD phase slowly advances over the CO one. This slow dynamics appears to be linked to the magnetic transitions occurring in this compound, suggesting important magnetoelastic effects. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.147206
DOI:
10.1103/PhysRevLett.94.147206
PACS:
75.47.Lx, 61.14.Lj, 61.20.Lc, 75.60.Ch
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