Superconductivity Transition and Crystal Structure of the High-T_c and High-H_<c2> Superconductor DyBa_2Cu_3O_<7-δ>

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Superconductivity transitions of DyBa_2Cu_3O_<7-δ> in the magnetic field up to 9 T are described together with the crystal structure analysis of the same samples by X-ray powder diffraction combined with Rietveld analysis. A very sharp transition at 93 K with the transition width of 1.2 K in zero magnetic field is observed and the width is still small even in the magnetic field. The upper critical field H_<c2> near T_c is very large; the offset field H^<off>_<c2> defined at 1 % points is 10 T even at 80 K and the slope (-dH_<c2>/dT) for midpoint is 5.5 T/K. According to the structure analysis, single phase with orthorhombic structure is responsible for the high-T_c and high-H_<c2> superconductivity in DyBa_2Cu_2O_<7-δ> as in YBa_2Cu_2O_<7-δ> and RBa_2Cu_2O_<7-δ> (R=Ho or Er).
社団法人応用物理学会の論文
1987-06-20