Existence of the Minimum Coefficient in Temperature Linear Term of Heat Capacity in Superconducting(La1-xBax)2CuO4

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  • Kobayashi Tatsuo
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Kumayasu Satoshi
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Amaya Kiichi
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Ishida Kenji
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Kitaoka Yoshio
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Asayama Kunisuke
    Department of Material Physics, Faculty of Engineering Science, Osaka University

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  • Existence of the Minimum Coefficient in Temperature Linear Term of Heat Capacity in Superconducting (La<SUB>1−<I>x</I></SUB>Ba<I><SUB>x</SUB></I>)<SUB>2</SUB>CuO<SUB>4</SUB>
  • Existence of the Minimum Coefficient in
  • Existence of the Minimum Coefficient in Temperature Linear Term of Heat Capacity in Superconducting (La<sub>1-<i>x</i></sub>Ba<sub><i>x</i></sub>)<sub>2</sub>CuO<sub>4</sub>

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In high-Tc superconductors (La1−xMx)2CuO4 (M=Ba, Sr), it has been reported that the heat capacity has a nonzero coefficient γ in the temperature linear term. We investigated the detailed dependence of γ on Ba doping. It was confirmed that γ becomes zero for undoped La2CuO4. With increasing Ba concentration x, γ increases markedly up to x=0.02 where the magnetic order almost disappears, while it decreases as superconductivity starts to appear and then has a minimum around x=0.04. With further increasing x, γ increases again. These results may be due to a combined effect of two different contributions to γ.

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