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    Title: Exotic properties of spinel oxide superconductor Li1+xTi2O4
    Authors: Liao, Y. C.;Du, C. H.;Xu, F.;Wang, M. J.;Wu, C.;Hsu, Y. Y.;Wu, M. K.
    Contributors: 淡江大學物理學系
    Date: 2004-08
    Issue Date: 2013-07-09 15:08:00 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: 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.
    Relation: Physica C: Superconductivity and its Applications 408-410, pp.369-371
    DOI: 10.1016/j.physc.2004.02.109
    Appears in Collections:[物理學系暨研究所] 期刊論文

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