Magnetic-field irreversibility in superconductive Cu-m212 (m=1, 2)
作者： Takayuki Nakane , Maarit Karppinen , Hisao Yamauchi
DOI: 10.1016/S0921-4534(01)00214-3
关键词: Lattice (order) 、 Superconductivity 、 Analytical chemistry 、 Charge-carrier density 、 Materials science 、 Magnetic field 、 Condensed matter physics
摘要: Abstract The magnetic-field irreversibility ( H irr ) characteristics of the CuBa 2 YCu O 7− δ (Cu-1212 or so-called “123”) and Cu Ba 8− (Cu-2212 “124”) phases are studied with respect to hole-doping level isovalent-substitution effect. For both enhanced increasing overall level. When comparing fully oxygenated samples, line Cu-2212 phase is located at magnetic fields lower than that Cu-1212 phase. Sr(II)-for-Ba(II) substitution not effective in enhancing Cu- m 212 phases. It rather lowers case On other hand, Yb(III)-for-Y(III) enhances Both types isovalent substitution, i.e. Sr-for-Ba Yb-for-Y, result contraction lattice dimensions, but work oppositely terms effect on characteristics. Therefore it considered control over simply achieved by lattice-dimension change homogeneity hole-density distribution crystal.
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