High-pressure study on high-Tc (ZnPc) Bi-2223 oxides

J. G. Lin, C. Y. Huang, Y. Y. Xue, C. W. Chu, L. Grigoryan, K. Yakushi

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5 Citations (Scopus)

Abstract

We have measured the pressure effect on the superconducting transition temperature Tc and the normal-state resistivity R for the high-Tc Bi-2223 oxides intercalated with zinc-phthalocyanine (ZnPc). At ambient pressure, Tc is degraded from 110 K to 90 K with the intercalation of 0.01 ZnPc per unit cell, and T changes its temperature dependence from metallic to semiconducting-like behavior, suggesting that the intercalation affects the electronic structure of the CuO2 plane significantly. We have obtained dTc/dP=1.9±0.3, 1.7±0.4 and 1.8±0.3 K/GPa for samples with Tc=110, 100 and 90 K, respectively. On the other hand, the normalized pressure effect on the normal-state resistivity dln R/dP is rather different for these three samples, changing from 2%/GPa to -20%/GPa. We have tentatively ascribed the nearly constant value of dTc/dP (≈2 K/GPa) to the pressure effect on the hopping integrals of the conducting holes, and the large variation in dln R/dP to the enhanced compressibility along the c-axis.

Original languageEnglish
Pages (from-to)177-181
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume231
Issue number1-2
DOIs
Publication statusPublished - 1994 Sep 20

All Science Journal Classification (ASJC) codes

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

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