Effect of Hole-Doping in High-<I>T</I><SUB>c</SUB> Ln<SUB>1</SUB>Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ</SUB> (Ln=Nd, La, Pr)

• Uwe Hiromoto

  Institute of Applied Physics, University of Tsukuba

• Sakudo Tunetaro

  Institute of Applied Physics, University of Tsukuba

• Asano Hajime

  Institute of Materials Science, University of Tsukuba

• Han Tae-Su

  Institute of Applied Physics, University of Tsukuba

• Yagi Kazuhiro

  Institute of Applied Physics, University of Tsukuba

• Harada Ryusuke

  Institute of Applied Physics, University of Tsukuba

• Iha Michiaki

  Institute of Applied Physics, University of Tsukuba

• Yokoyama Yasuharu

  Corporate Research & Development Laboratory, Toa Nenryo Kogyo K.K.

抄録

Systems of solid solution Ln_1−xCa_xBa₂Cu₃O_7−δ (Ln=Nd, La, Pr) have been investigated in order to clarify the effect of hole-doping on the superconducting state. The transition temperature T_c decreases with increasing Ca-ion substitution in either Nd_1−xCa_xBa₂Cu₃O_7−δ or La_1−xCa_xBa₂Cu₃O_7−δ. Combined with the fact that the electron-doping in the system Ln_1+xBa_2−xCu₃O_7−δ (Ln=La, Nd, Eu) decreases T_c, the experiment indicates that the nondoped LnBa₂Cu₃O_7−δ (Ln=Nd, La) has an optimum carrier concentration for T_c. For the nonsuper-conducting Pr_1−xCa_xBa₂Cu₃O_7−δ, the conductivity at 77 or 280 K exhibits a maximum at the formal valence of ca.3 for Pr_1−xCa_x.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 27 (4), L577-L579, 1988

  社団法人応用物理学会

キーワード

• high temperature superconductivity
• NdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB>
• alloying effect

詳細情報

• CRID: 1570854177335837184
• NII論文ID: 110003928048
• NII書誌ID: AA10650595
• 本文言語コード: en
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