Enhanced superconducting properties of double-chain based superconductor Pr${}_2$Ba${}_4$Cu${}_7$O${}_{15-\delta }$ synthesized by citrate pyrolysis technique

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$\sim 55\%$, 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$\times 10^{-3}$ 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.

7 pages, 6 figures, 1 table. arXiv admin note: substantial text overlap with arXiv:1609.00125, arXiv:1512.01300