Optimization of Pr0.9Ca0.1MnO3 thin ﬁlms with varying in-situ oxygen annealing treatments
Wihuri Physical Laboratory, Department of Physics and
Astronomy, University of Turku, FI-20014
2 The National Graduate School in Material Physics (NGSMP), Helsinki, Finland
a e-mail: firstname.lastname@example.org
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 diffractometry 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 Mn3+ 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.
© Owned by the authors, published by EDP Sciences, 2013