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    Anomalies of upper critical field in the spinel superconductor LiTi2 O4-δ by Z Wei, G He, W Hu, Z Feng, X Wei, Q Li, J Yuan, Anna Kusmartseva, C Xi, Z Wang, Q Chen, B Zhu, F Zhou, X Dong, L Pi, Feodor Kusmartsev, Z Zhao, K Jin

    Published 2019
    “…High-field electrical transport and point-contact tunneling spectroscopy are used to investigate superconducting properties of spinel oxide LiTi2O4-δ films with various oxygen contents. It is striking that although the superconducting transition temperature and energy gap are almost unchanged, an isotropic upper critical field Bc2 up to 26.0 T is observed in the oxygen-rich sample, which is more than twice the Bc2 of 11.3 T in the anoxic one. …”
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