Enhanced superconducting properties of double-chain based superconductor Pr2Ba4Cu7O15−δ synthesized by citrate pyrolysis technique

Kazuma Honnami, Michiaki Matsukawa, Tatsuya Senzaki, Tomoki Toyama, Haruka Taniguchi, Koichi Ui, Takahiko Sasaki, Kohki Takahashi, Makoto Hagiwara

Research output: Contribution to journalArticlepeer-review

Abstract

We report the enhanced superconducting properties of double-chain based superconductor Pr2Ba4Cu7O15−δ synthesized by the citrate pyrolysis technique. The reduction heat treatment in vacuum results in the appearance of superconducting state with Tc=22-24 K, accompanied by the higher residual resistivity ratios. The superconducting volume fractions are estimated from the ZFC data to be 50∼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 RH of the 48-h-reduced superconducting sample is determined to be −0.5×10−3 cm3/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.

Original languageEnglish
Article number1353869
JournalPhysica C: Superconductivity and its applications
Volume585
DOIs
Publication statusPublished - 2021 Jun 15

Keywords

  • 74.25.F-
  • 74.25.Ha
  • 74.90.+n

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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