Exotic properties of spinel oxide superconductor Li1+xTi 2O4

Y. C. Liao, C. H. Du, F. Xu, M. J. Wang, C. Wu, Y. Y. Hsu, M. K. Wu

    研究成果: 雜誌貢獻Conference article同行評審

    2 引文 斯高帕斯(Scopus)

    摘要

    The polycrystalline Li1+xTi2O4 has intricate physical behaviors in normal and superconducting state. High-resolution X-ray diffraction shows that it is the pure spinel phase and there is no structural phase transition down to 20 K. In addition to the field-induced broadening of R(T) near the superconducting regime, an anomalous upturn in R(T) appears near the transition temperature when magnetic field is above 3 T. This anomalous resistivity upturn regime diminishes with the adding of Li, which increases the conductivity of sample. The superconductivity is suppressed at field above 14 T and temperature above 4.2 K, meanwhile the low temperature resistance behaves semiconductor-like. It resembles to the metal-insulator transition observed in La214 under high magnetic field. Furthermore, the sample exhibits other interesting features: a significant positive magnetoresistance below 40 K, e.g., ΔR(H)/R(H=0)∼3% at T=14 K and H=16 T; ZFC and FC curves of magnetization measured below 1000 G split around 170 K; and Hall measurements also show that charge carriers change sign from negative to positive around 170 K. These experimental facts suggest that magnetic property and electronic structure strongly correlate with each other.

    原文英語
    頁(從 - 到)369-371
    頁數3
    期刊Physica C: Superconductivity and its applications
    408-410
    發行號1-4
    DOIs
    出版狀態已發佈 - 2004 八月 1
    事件Proceedings of the International Conference on Materials - Rio de Janeiro, 巴西
    持續時間: 2003 五月 252003 五月 30

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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