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

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)260-264
ページ数5
ジャーナルPhysica C: Superconductivity and its Applications
378-381
PART 1
DOI
出版ステータスPublished - 2002 10 1
外部発表はい

ASJC Scopus subject areas

  • Condensed Matter Physics

フィンガープリント 「Hole density of (La<sub>1-x</sub>Ca<sub>x</sub>)(Ba<sub>1.75-x</sub>La<sub>0.25+x</sub>)Cu<sub>3 </sub>O<sub>7+d</sub> synthesized by amorphous metal-complex method」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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