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Superconductivity, electronic phase diagram, and pressure effect in Sr1−xPrxFBiS2

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Abstract

Based on a combination of X-ray diffraction, electrical transports, magnetic susceptibility, specific heat, and pressure-effect measurements, we report the results of experiments on a series of BiS2-based Sr1−xPrxFBiS2 superconductors with the maximum Tc of 2.7 K for x=0.5 and at ambient pressure. Superconductivity appears only for 0.4≤x≤0.7 whereas the normal-state resistivity shows the semiconducting-like behaviors. The magnetic susceptibility χ(T) displays the low superconducting shielding volume fractions and C(T) shows no distinguishable anomaly near Tc, which suggests a filamentary superconductivity in the Pr-doped polycrystalline samples. By varying doping concentrations, an electronic phase diagram is established. Upon applying pressure on the optimally doped Sr0.5Pr0.5FBiS2 system, Tc is abruptly enhanced, reaches 8.5 K at the critical pressure of Pc=1.5 GPa, and increases slightly to 9.7 K at 2.5 GPa. Accompanied by the enhancement of superconductivity from the low- to the high-Tc phases, the normal state undergoes a semiconductor-to-metal transition when under pressure. This scenario may be linked to enhanced overlap of the Bi-6p and S-p orbitals, which contributes to the enhanced superconductivity above Pc. The pressuretemperature phase diagram for Sr0.5Pr0.5FBiS2 is also presented.

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Authors and Affiliations

  1. Department of Physics and Hangzhou Key Laboratory of Quantum Matter, Hangzhou Normal University, Hangzhou, 311121, China

    Wei You, Lin Li, HaiYang Yang, JiaLu Wang, HongYing Mao, JianHui Dai & YuKe Li

  2. Wuhan National High Magnetic Field Center School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    YongKang Luo

  3. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China

    ChuanYing Xi

  4. College of Science, Center of Advanced Functional Ceramics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China

    Jie Cheng

  5. Department of Physics, China Jiliang University, Hangzhou, 310018, China

    Li Zhang

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  1. Wei You
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Correspondence to JianHui Dai or YuKe Li.

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You, W., Li, L., Yang, H. et al. Superconductivity, electronic phase diagram, and pressure effect in Sr1−xPrxFBiS2. Sci. China Phys. Mech. Astron. 62, 957411 (2019). https://doi.org/10.1007/s11433-018-9326-4

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  • DOI: https://doi.org/10.1007/s11433-018-9326-4

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