Himeda A, Kato T, Ogata M
Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 Japan.
Phys Rev Lett. 2002 Mar 18;88(11):117001. doi: 10.1103/PhysRevLett.88.117001. Epub 2002 Feb 27.
We study the interplay between stripes and d-wave superconductivity in the two-dimensional t-t'-J model using a variational Monte Carlo method. The next-nearest-neighbor hopping t'<0 stabilizes the stripe states around 1/8 hole doping rate. We find that stripes and spatially oscillating superconductivity coexist depending on parameters. The superconducting orders are enhanced at the hole stripe regions. Although the energy differences are relatively small, the stripe state in which the phases between adjacent superconducting stripes are the opposite (antiphase) is also stabilized. We consider the possibility that the antiphase coexistence may explain the weakness of the c-axis Josephson couplings in the La1.6-xNd0.4SrxCuO4.
我们使用变分蒙特卡罗方法研究二维t - t'- J模型中条纹与d波超导之间的相互作用。次近邻跃迁t'<0使1/8空穴掺杂率附近的条纹态稳定。我们发现，根据参数不同，条纹与空间振荡超导共存。空穴条纹区域的超导序增强。尽管能量差相对较小，但相邻超导条纹之间相位相反（反相）的条纹态也稳定。我们考虑反相共存可能解释La1.6 - xNd0.4SrxCuO4中c轴约瑟夫森耦合较弱的可能性。
