Superconductivity in LiTi2O4 Prepared by Hybrid Microwave Method
YANG Li-Hong1,2, DONG Cheng1, SONG Hui-Hua2, GUO Juan1, FU Guang-Cai1
1National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Chemistry, Hebei Normal University, Shijiazhuang 050091
Superconductivity in LiTi2O4 Prepared by Hybrid Microwave Method
YANG Li-Hong1,2;DONG Cheng1;SONG Hui-Hua2;GUO Juan1;FU Guang-Cai1
1National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Chemistry, Hebei Normal University, Shijiazhuang 050091
Abstract： The well-known superconducting oxide LiTi2O4 has a structural phase transition from spinel to ramsdellite around 900°C. We have successfully obtained the superconducting spinel phase and the non-superconducting ramsdellite phase of LiTi2O4 using a hybrid microwave method. The samples are characterized by x-ray powder diffraction, scanning electron microscopy, and measurements of resistivity and magnetic susceptibility. The results show that the low-temperature spinel phase is a superconductor with Tc=13K, while the high-temperature ramsdellite phase is a semiconductor. By comparison between the crystal structures of the spinel and the ramsdellite phases, it is suggested that the geometrical frustration plays an important role in the superconductivity of the spinel LiTi2O4.
2005, Vol. 22 
