Generally what is called high-Tc superconductivity is found in the copper oxide and it is thought that existence of the CuO2 plane is essential for the appearance. In this presentation, I introduce the anomalous magnetism at the CuO2 plane and the unique superconducting properties at the one-dimensional Cu-O chain observed in Pr-based copper oxide. As for Pr-based compounds, there are two types of the crystal structure. One is Pr-123 with one-dimensional single chain. The other is Pr-124 with one-dimensional double chain. The CuO2 planes of both compounds are antifferomagnetic insulator and don’t show superconductivity seen in other copper oxides. However, it is recently reported that Pr-247, which consists of sandwiched structure of non-superconducting Pr-123 and Pr-124 becomes superconductor. Similarly, the CuO2 plane is antifferomagnetic insulator and doesn’t contribute to the appearance of the superconductivity. It is confirmed by the spin-lattice relaxation time measurement that the double chain becomes the quasi- one-dimensional superconducting state. Finally I discuss the origin of superconductivity in this compound.

　一般に高温超伝導体は銅酸化物で起こりその発現にはCuO2面の存在が必要不可欠であると考えられている。今回は銅酸化物であるPr化合物に見られるCuO2面の特異な磁性と一次元のチェーンで引き起こされる新奇な超伝導について紹介する。 Pr化合物は大きく分けて一次元のsingle-chainを有するPr-123、double-chain有するPr-124の二種類ある。共にCuO2面は反強磁性の絶縁体であり他の銅酸化物でみられる超伝導性を示さない。しかしこのふたつの化合物をサンドウィッチ状に交互に重ねたPr-247は超伝導体になる。CuO2面においては同じく反強磁性絶縁体であり、超伝導発現には寄与していない。核スピン格子緩和時間の実験からdouble-chainが擬一次元の超伝導状態になっていることがわかりその起因についても最後に考察する。

S.Sasaki et al., cond-mat/0603067(2006)