Journal of Low Temperature Physics

, Volume 131, Issue 3–4, pp 569–574 | Cite as

The Preparation Effect of Li1+xTi2O4 and Its Aging Effect

  • Fongchi Xu
  • Y. C. Liao
  • M. J. Wang
  • C. T. Wu
  • K. F. Chiu
  • M. K. Wu
Article

Abstract

We have successfully prepared the spinel Li1+xTi2O4, which is a type II superconductor with Tc∼12K, by solid-state reaction process. Owing to the volatility of lithium, excess lithium precursor up to molar fraction 0.15 was added during the synthesis to result in single phase Li1+xTi2O4 without any impurity phase in high resolution XRD pattern. The normal state temperature dependence of resistivity shows an initial semiconductor-like behavior, but turn into metallic-like at about 200K. Magnetization measurements show bulk superconductivity in the fresh samples. The sample is unstable to the exposure of air and humidity. It is observed that the resistive transition quickly diminishes with the exposure to air. However, the magnetic transition remains as sharp, only with the decrease in its superconducting volume fraction, even when the resistive transition completely disappears. An anomalous metal-insulator transition in the aged sample is observed at the same temperature as the superconducting transition temperature of the fresh sample.

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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Fongchi Xu
    • 1
  • Y. C. Liao
    • 1
  • M. J. Wang
    • 1
  • C. T. Wu
    • 1
  • K. F. Chiu
    • 2
  • M. K. Wu
    • 1
  1. 1.Department of Physics and Materials Science CenterNational Tsing Hua UniversityHsinchuTaiwan, ROC. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC
  2. 2.Department of Materials Science EngineeringFeng-Chia UniversityTaichungTaiwan, ROC

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