Using this growth technique, EuTiO3 films grown on SrTiO3 substrate exhibit an out-of-plane lattice shrinkage, which could be relaxed by postannealing. Valence instabilities of Eu were found in the sample and result in the EuTiO3 films being ferromagnetic at room temperature, which provides an opportunity to study further their properties and potential applications. Acknowledgements
We thank check details Tielong Shen and Ji Wang from the Institute of Modern Physics, Chinese Academy of Sciences for their technical help on TEM measurements. This work was supported by the National Basic Research Program of China (Grant No. 2012CB933101), National Natural Science Foundation of China (Grant Nos. 11274147, 51371093, and 11034004), PCSIRT (Grant No. IRT1251), and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2013-ct01 and lzujbky-2014-174).
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