论文标题
通过纵向压缩可能会增强阶梯式酸奶中超导性的违反直觉
Possible counterintuitive enhancement of superconductivity in ladder-type cuprates by longitudinal compression
论文作者
论文摘要
从理论上讲，我们研究阶梯型铜酸盐超导体单轴变形的影响。基于第一原理计算的模型构建表明，当纵向（腿）方向压缩晶格时，最近邻居跳的跑率与腿部比率会增加。这导致了超导过渡温度的增强，当在梯级方向压缩时，预计会直观地预期。这样的趋势可以追溯到Cu $ 4S $和Cu $ d_ {x^2-y^2} $ orbitals的现场杂交，该趋势在晶格变形时变化并更改符号。
We theoretically study the effect of uniaxial deformation of ladder-type cuprate superconductors. Model construction based on first principles calculation shows that the rung-to-leg ratio of the nearest neighbor hoppings counterintuitively increases when the lattice is compressed in the longitudinal (leg) direction. This leads to an enhancement of the superconducting transition temperature, which intuitively is expected when compressed in the rung direction. Such a trend is traced back to the on-site hybridization between Cu$4s$ and Cu$d_{x^2-y^2}$ orbitals, which varies and changes sign upon lattice deformation.
