Volume 82, Number 1, April 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||18 March 2008|
Pressure effects on the charge ordering in Bi0.4Ca0.6MnO3 films of different orientation
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences - Beijing 100080, PRC
2 Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China - Hefei 230026, PRC
Corresponding author: email@example.com
Accepted: 5 February 2008
Effects of hydrostatic pressure on the charge ordering (CO) transition in the Bi0.4Ca0.6MnO3 films respectively grown on (110) and (111) SrTiO3 substrates have been experimentally studied. X-ray diffraction analysis indicates the occurrence of very differently deformed structures of the two films. Linear decrease of the CO temperature (T)at different rates, ~ 12K/GPa for the (110)-film and ~ 19K/GPa for the (111)-film, is observed. Accompanying the depression of TCO, partial melting of the charge-ordered phase occurs above a threshold pressure, ~ 0.8/1.2 GPa for the (111)/(110)-film. Analysis of the relative volume fraction of the CO phase, obtained based on the effective medium theory, shows that the CO collapsing occurs in a wide pressure range, typically ~ 1.2 GPa in width, and there will be no long-range CO phase above the pressure of ~ 2/2.3 GPa for the (111)/(110)-film. There is an exact correspondence between the CO melting and the pressure-driven upturn of resistivity above TCO, suggesting the simultaneous occurrence of CO melting and shear-type lattice distortion. Different lattice strains are believed to be the reason for the dissimilar behaviors of the two films.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 75.47.Lx – Manganites / 73.50.-h – Electronic transport phenomena in thin films
© EPLA, 2008
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