Stripe states with spatially oscillating d-wave superconductivity in the two-dimensional t-t′-J model -: art. no. 117001
Stripe states with spatially oscillating d-wave superconductivity in the two-dimensional t-t′-J model -: art. no. 117001
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DOI：
10.1103/physrevlett.88.117001
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发表时间：
2002-03-18
影响因子：
8.6
通讯作者：
Ogata, M
中科院分区：
文献类型：
--
作者：
Himeda, A;Kato, T;Ogata, M
本文用变分蒙特卡罗方法研究了二维t-t '-J模型中条纹与d波超导性的相互作用。次近邻跃迁t' < 0使条纹态稳定在1/8空穴掺杂率附近。我们发现条纹和空间振荡超导共存依赖于参数。在空穴条纹区，超导有序度得到增强。虽然能量差相对较小，但是其中相邻超导条带之间的相位相反（反相）的条带状态也稳定。我们认为，反相共存的可能性，可以解释在La 1.6-xNd 0.4SrxCuO 4的c轴约瑟夫森耦合的弱点。
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.