1. Enhanced superconducting properties of double-chain based superconductor Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta}$ synthesized by citrate pyrolysis technique
- Author
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Honnami, Kazuma, Matsukawa, Michiaki, Senzaki, Tatsuya, Toyama, Tomoki, Taniguchi, Haruka, Ui, Koichi, Sasaki, Takahiko, Takahashi, Kohki, Hagiwara, Makoto, and Ishikawa, Fumihiko
- Subjects
Condensed Matter - Superconductivity - Abstract
We report the enhanced superconducting properties of double-chain based superconductor Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta}$ synthesized by the citrate pyrolysis technique. %In spite of the polycrystalline bulk samples, we obtained the higher residual resistivity ratios (10-12). The reduction heat treatment in vacuum results in the appearance of superconducting state with $T_\mathrm{c}$=22-24 K, accompanied by the higher residual resistivity ratios. The superconducting volume fractions are estimated from the ZFC data to be 50$\sim55\%$, indicating the bulk superconductivity. We evaluate from the magneto-transport data the temperature dependence of the superconducting critical field, to establish the superconducting phase diagram. The upper critical magnetic field is estimated to be about 35 T at low temperatures from the resistive transition data using the Werthamer-Helfand-Hohenberg formula. The Hall coefficient $R_{H}$ of the 48-h-reduced superconducting sample is determined to be -0.5$\times10^{-3}$ cm$^{3}$/C at 30 K, suggesting higher electron concentration. These findings have a close relationship with homogeneous distributions of the superconducting grains and improved weak links between their superconducting grains in the present synthesis process., Comment: 7 pages, 6 figures, 1 table. arXiv admin note: substantial text overlap with arXiv:1609.00125, arXiv:1512.01300
- Published
- 2021
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