d波超导体中由晶格各向异性和磁性杂质引起的可调谐条纹图样
Tunable striped-patterns by lattice anisotropy and magnetic impurities in d-wave superconductors
摘要：
计算观察了近最佳掺杂d波超导体中由晶格各向异性和磁性杂质引起的图样转变。对于单一杂质的情况下，从棋盘形的条纹图案的过渡，可以诱导即使在一个非常弱的LA。此外，在自旋顺序的八个晶格常数（8 $a$）的调制周期与中子散射数据相吻合。对于双杂质的情况下，从纵向杂质钉扎条纹到横向图案的取向转变时，观察到的LA比达到某个临界值。在临界点，磁性杂质周围的结构可以恢复棋盘格图案。这些结果表明，条纹的形成可能是由多种因素引起的，并且可以通过实验进行调节。
英文摘要：
The pattern transition induced by lattice anisotropy (LA) and magnetic impurities is computationally observed in near-optimally doped d-wave superconductors (DSCs). For the single impurity case, a transition from the checkerboard to stripe pattern can be induced even with a very weak LA. Moreover, the modulation period of eight lattice constants (8$a$) in the spin order coincides with neutron scattering data. For the two-impurity case, an orientation transition from the longitudinal impurity-pinned stripe into the transverse pattern is observed when the LA ratio reaches some critical value. At the critical point, it is found that the structures around magnetic impurities could restore checkerboard patterns. These results indicate that the formation of stripes in DSCs might induced by various effects, and could be tunable experimentally.
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