Abstract
The spinel oxide superconductor LiTi 2 O 4 shows intricate transport properties in both normal state and superconducting state. The Hall effect measurements exhibit an abrupt change in carrier density near T = 170K where the temperature derivative of resistivity changes sign from negative to positive on cooling. In addition, the sample shows significant positive magnetoresistance below 40K, e.g., ΔR(H)/R(H = 0) ∼ 3% at T = 14K and H = 16T. A most interesting feature is the magnetic field effect on the resistivity near the superconducting state. In addition to the field-induced broadening of R(T), there exhibits an anomalous upturn in R(T) near the superconducting regime when magnetic field is above 3T. The temperature T 1 at which R(T) shows upturn linearly correlates with magnetic field H and can be expressed as T 1 /T C(H=0) = 1 - 0.04H for 3T < H < 12T. The superconductivity is completely suppressed at field above 14T and the low temperature resistance behaves semiconductor-like.
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