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Abstract
The influence of in situ oxygen annealings on narrow electronic bandwidth Pr0.9Ca0.1MnO3 films are investigated in the complex phase separation region. Measurements by x-ray di!ractometry and SQUID magnetometry reveal that relatively high deposition temperature at 700 ! C relaxes the lattice by twin boundaries while the lower deposition temperature at 500 ! C with higher post-annealing temperature of 700 ! C relaxes the substrate induced strain via oxygen absorption and makes the film structure more homogeneous. This behaviour is clearly supported by the decrease of ferromagnetic ordering due to decrease of Mn 3+ ions in films oxygen annealed at high temperatures and this phenomenon is widely discussed with the models of double-exchange interaction, trapping of carriers in the oxygen vacancies and formation of magnetic polarons. The results show unambiguously that because the oxygen content tailors many physical properties dramatically, the annealing treatments are in very important role when optimizing these materials for future applications.
Highlights
To use this material in the potential applications, we have systematically investigated the effect of oxygen non-stoichiometry in Pr0.9Ca0.1MnO3 thin films
The films with thickness of 100 nm were grown on (001) SrTiO3 (STO) substrates by pulset laser deposition (PLD) technique from high purity PCMO target prepared by the solid state method [7]
The out-of-plane crystallographic texture is determined by means of XRD rocking curves (RC) of PCMO (060) peaks (ω scans)
Summary
The perovskite manganite compound Pr1−xCaxMnO3 (PCMO) has narrow electric bandwidth W [4], which distinguish it from more studied manganite compounds with broader W. Due the narrow W, PCMO is insulating in the whole doping range and it has stable charge-ordered (CO) phase in the hole doping range of x = 0.3 − 0.5. Low hole doped Pr0.9Ca0.1MnO3 is still quite unexplored, our recent investigation showed that complex phase separated region exists in this system leading to interesting photo-induced magnetization phenomenon [1]. To use this material in the potential applications, we have systematically investigated the effect of oxygen non-stoichiometry in Pr0.9Ca0.1MnO3 thin films
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