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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 |
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| Cite this article: |
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YANG Li-Hong, DONG Cheng, SONG Hui-Hua et al 2005 Chin. Phys. Lett. 22 243-245 |
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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.
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| Keywords:
81.20.-n
74.62.Bf
74.70.Dd
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Published: 01 January 2005
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| PACS: |
81.20.-n
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(Methods of materials synthesis and materials processing)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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