Effects of nonmagnetic impurity atoms on the spin-density-wave model of high-temperature superconductivity
- Department of Materials Science, Faculty of Science, Hiroshima University, Higashi-senda, Naka-ku, Hiroshima 730, Japan (JP)
- Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan (JP)
We present the effects of nonmagnetic impurity atoms in high-temperature superconductivity. We employ the perturbation expansion in the weak-scattering region for a model of superconductivity induced by spin-density-wave (SDW) fluctuations. We assert that there are two competing effects: (i) The impurity atoms reduce the SDW gap, thus increasing the attractive interaction between holes and consequently increasing the superconducting gap {Delta}{sub SC}; (ii) the nonmagnetic impurity atoms in this model apparently behave as though they are magnetic, thus causing pair breaking and accordingly reducing {Delta}{sub SC}. We find that the latter effect is more dominant than the former; thus altogether the superconducting gap {Delta}{sub SC} is reduced by the nonmagnetic impurity atoms. We also discuss the relationship to the experimental results concerning the reduction of the critical temperature due to the nonmagnetic impurity atoms.
- OSTI ID:
- 7186048
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 41:10; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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