Pressure effects on the charge ordering in Bi0.4Ca0.6MnO3 films of different orientation

J. Z. Wang, J. R. Sun, W. Zhang, R. C. Yu, Yunzhong Chen, B. G. Shen, W. B. Wu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 (TCO) at different rates, ~12 K/GPa for the (110)-film and ~19 K/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.
Original languageEnglish
Article number16002
JournalEPL
Volume82
Issue number1
Number of pages6
ISSN0295-5075
DOIs
Publication statusPublished - 2008
Externally publishedYes

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