Abstract
The effects of grain size (G S) on the structural, magnetic and magnetoresistance properties of sol–gel-derived Nd0.67Ca0.33MnO3 (NCMO) nanocrystalline thin films were investigated. To change the G S of the NCMO samples, the annealing temperature (T A) was changed from 600 to 800 °C. All the prepared samples were confirmed as hexagonal single-phased polycrystalline structure. The average nanocrystalline size and G S were increased with increasing T A. The range of the G S was approximately 25–40, 50–65 and 75–90 nm for the NCMO samples annealed at T A = 600, 700 and 800 °C, respectively. As the G S increased, the metal–insulator transition temperature, T MI, and the paramagnetic–ferromagnetic transition temperature, T C, also increased including the ferromagnetic response. The magnetoresistance, MR, values were found to increase with increasing the G S at any annealing temperature.
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Acknowledgments
This work was supported by the Higher Education Council of Turkey (YOK). The authors are grateful to Prof. Dr. Yasuji Yamada and Dr. Funaki Shuhei, Department of Physics and Materials, Interdisciplinary Faculty of Science and Engineering, Shimane University, Japan, for hosting and guiding Abdullah Göktaş during his scientific fellowship at Shimane University.
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Göktaş, A., Tumbul, A. & Aslan, F. Grain size-induced structural, magnetic and magnetoresistance properties of Nd0.67Ca0.33MnO3 nanocrystalline thin films. J Sol-Gel Sci Technol 78, 262–269 (2016). https://doi.org/10.1007/s10971-016-3960-0
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DOI: https://doi.org/10.1007/s10971-016-3960-0