Hole density of (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+d synthesized by amorphous metal-complex method

Y. Tanaka, T. Katsumata, A. Yamaguchi, H. Yasuoka, T. Kawahara, Y. Sato, M. Osada, M. Kakihana

Research output: Contribution to journalArticle

Abstract

We measured the resistivity and the optical reflectivity spectra, and performed the coulometric titration to examine the average hole density in tetragonal (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+d superconductors. High-purity polycrystalline samples were synthesized for Ca cation content 0≤ x ≤ 1 by the amorphous metal-complex method. With increasing x Tc increases until x = 0.5-0.6, then decreases over x = 0.6. Temperature dependence of the resistivity in 0.4 ≤ x ≤ 0.9 shows a linear relation like a metallic behavior. The resistivity at room temperature decreases until x = 0.5, and increases over x = 0.5. The x dependence of the optical conductivity within the low energy region is consistent with the results of electrical dc conductivity. The results of the plasma frequency and the coulometric titration also show the tendency that the hole density increases until x = 0.5 and decreases over x=0.5 with increasing x.

Original languageEnglish
Pages (from-to)260-264
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • (LaCa)(BaLa)Cu O
  • Coulometric titration
  • Hole density
  • Optical conductivity
  • Resistivity

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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    Tanaka, Y., Katsumata, T., Yamaguchi, A., Yasuoka, H., Kawahara, T., Sato, Y., Osada, M., & Kakihana, M. (2002). Hole density of (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+d synthesized by amorphous metal-complex method. Physica C: Superconductivity and its applications, 378-381(PART 1), 260-264. https://doi.org/10.1016/S0921-4534(02)01424-7