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    題名: Correlation between A-site randomness and magnetic phase transition in half-doped manganite Pr0.5Ba0.5MnO3
    作者: Ling, D. C.;Hsu, P. C.;Lee, C. L.
    貢獻者: 淡江大學物理學系
    日期: 2012
    上傳時間: 2013-01-15 17:37:58 (UTC+8)
    出版者: Bristol: Institute of Physics
    摘要: The interplay between A-site randomness and magnetic phase transition in half-doped manganite Pr0.5Ba0.5MnO3 (PBMO) was extensively investigated. The H/M versus M2 isotherms show that the A-site ordered PBMO undergoes a second-order magnetic phase transition from paramagnetism to ferromagnetism, whereas the A-site disordered PBMO exhibits a fluctuation-driven first-order transition arising from a competing order phase possibly existing in the paramagnetic state. A step-like transition in magnetization and resistivity with a sharp width of ΔH/H ~ 10−3 was only observed in the A-site partially ordered PBMO at 2 K, indicating that the metamagnetic transition is associated with a competition between randomly distributed short-range ferromagnetic and antiferromagnetic phases. These findings provide evidence that the A-site randomness not only suppresses A-type antiferromagnetism also moderately weakens long-range ferromagnetism in the A-site ordered PBMO.
    關聯: Journal of Physics: Conference Series(JPCS) 400, 032047
    DOI: 10.1088/1742-6596/400/3/032047
    顯示於類別:[物理學系暨研究所] 期刊論文

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