Abstract
Ca-doped Bi-2201 samples obtained by optimized preparation methods increase the highest onset of superconducting transition T(c, onset) up to 77 K. Raman experiments show that Ca-doping makes the OSr peak shift from 643 to 647 cm−1, which indicates that the OSr and surrounding atoms become closer. In addition, pressure is used to amplify the effects of doping in the structural characterizations. High-pressure angle dispersive x-ray diffraction (ADXRD) results indicate that the Ca-doped Bi-2201 sample has a tighter atomic packing than the pure sample, which results in a lower Raman peak position shift rate under compression. Combining the ambient data with the high-pressure structural analysis, the apical oxygen of the CuO6 octahedron is closer to CuO2 plane and adjusts CuO2 plane distortion, resulting in the increasing of T(c, onset) in Ca-doped Bi-2201 samples.
Graphical Abstract
Highlights
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The experimental strategy of using pressure to amplify the influence of Ca-doping on the structure of Bi-2201 phase was proposed.
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Ca-doped Bi2201 crystals have smaller lattice volume, shorter c-axis, and are less compressible than the pure phase.
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The influence caused by the apical oxygen of the CuO6 octahedron on distortion of CuO2 plane is an important reason for increasing the Tc of the Ca-doped samples.
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Acknowledgements
This work is supported by National Natural Science Foundation of China (Nos. 52103201, 61971116), the Fundamental Research Funds for the Central Universities (No. N2002003), China Postdoctoral Science Foundation (No. 2018M631801), and Postdoctoral Foundation of Northeastern University (20180301). ADXRD measurement was performed at 4W2 beamline, Beijing Synchrotron Radiation Facility (BSRF), which was supported by the Chinese Academy of Sciences (Grants KJCX2‐SW‐N20 and KJCX2‐SW‐N03). Partial ADXRD experiments were performed at the BL15U1 beamline, Shanghai Synchrotron Radiation Facility (SSRF).
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Qi, Y., Sun, D., Zhao, X. et al. High pressure amplify the structural characteristic of calcium-doped Bi-2201 phase. J Sol-Gel Sci Technol 106, 107–113 (2023). https://doi.org/10.1007/s10971-023-06050-9
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DOI: https://doi.org/10.1007/s10971-023-06050-9