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    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/98488

    題名: Disorder-induced Room Temperature Ferromagnetism in Glassy Chromites
    作者: Moyses Araujo;Sandeep Nagar;Muhammad Ramzan;R. Shukla;O. D. Jayakumar;A. K. Tyagi;Liu, Yi-Sheng;Chen, Jeng-Lung;Per-Anders Glans;Chang, Chinglin 張經霖;Andreas Blomqvist;Raquel Lizárraga;Erik Holmström;Lyubov Belova;Guo, Jinghua;Rajeev Ahuja;K. V. Rao
    貢獻者: 淡江大學物理學系
    日期: 2014
    上傳時間: 2014-08-07 16:26:51 (UTC+8)
    出版者: London: Nature Publishing Group
    摘要: We report an unusual robust ferromagnetic order above room temperature upon amorphization of perovskite [YCrO3] in pulsed laser deposited thin films. This is contrary to the usual expected formation of a spin glass magnetic state in the resulting disordered structure. To understand the underlying physics of this phenomenon, we combine advanced spectroscopic techniques and first-principles calculations. We find that the observed order-disorder transformation is accompanied by an insulator-metal transition arising from a wide distribution of Cr-O-Cr bond angles and the consequent metallization through free carriers. Similar results also found in YbCrO3-films suggest that the observed phenomenon is more general and should, in principle, apply to a wider range of oxide systems. The ability to tailor ferromagnetic order above room temperature in oxide materials opens up many possibilities for novel technological applications of this counter intuitive effect.
    關聯: Scientific Reports 4, 4686
    DOI: 10.1038/srep04686
    顯示於類別:[物理學系暨研究所] 期刊論文


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