1998 年 67 巻 1 号 p. 41-44
Effects of the backward scattering with large momentum transfer areexamined in two-dimensional electron system with a special emphasison electrons around (π, 0), (0, π).The phase diagram is shown in the plane of temperature Tand hole doping δ in the mean field approximation and it is found that d-wave superconductivity, antiferromagnetism and π-triplet pair can coexist near half filling.
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