Thermodynamic properties of superconducting and non-superconducting Pr2Ba4Cu7O15 - δ compounds with metallic double chains

Takahisa Konno, Michiaki Matsukawa, Keisuke Sugawara, Haruka Taniguchi, Junichi Echigoya, Akiyuki Matsushita, Makoto Hagiwara, Kazuhiro Sano, Yoshiaki Ohno, Yuh Yamada, Takahiko Sasaki, Yuichiro Hayasaka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To examine the thermodynamic properties of Pr2Ba4Cu7O15-δ compounds with metallic CuO double chains, we measured the specific heats of superconducting and non-superconducting polycrystalline samples at low temperatures (1.8-40 K) under various magnetic fields (up to 9 T). In the as-sintered non-superconducting sample, a λ-like enhancement in the specific heat measurement appeared near the antiferromagnetic transition temperature TN=17 K. In contrast, the reduced superconducting sample with Tcon=26.5 K exhibited no obvious superconducting anomaly in its specific heat data, but a Schottky-like broad maximum appeared at low temperatures. The Schottky-like anomaly was attributed to low-lying quasi-triplet splitting of Pr3+ ions under the crystal field effect.

Original languageEnglish
Pages (from-to)13-17
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume521-522
DOIs
Publication statusPublished - 2016 Feb 15

Keywords

  • CuO double chains
  • PrBaCuO
  • Specific heat
  • Superconductivity

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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