论文标题
$ f $ - 波配对对称性的预测yba $ _2 $ cu $ _3 $ o $ _ {6+x} $ cuprates
Prediction of $f$-wave pairing symmetry in YBa$_2$Cu$_3$O$_{6+x}$ cuprates
论文作者
论文摘要
我们对具有两个CUO $ _2 $ planes的三频哈伯德模型和一个用于YBCO蛋糕的单个CUO链层进行了数值模拟。自旋 - 透明介导的配对相互作用是在多播随机相近似中计算的，其配对特征值和特征函数是作为链状态填充因子$ N_C $的函数求解的。我们发现，对于ybco样本中$ n_c $的内在值，一个通常的$ d $ - 波配对对称性。但是，如果我们用孔将链层涂上，则在保持平面状态固定的同时，领先的配对对称溶液将成为非常规的$ f $ - 波对称对称性。 $ f $ - 波配对背后的机制是飞机之间的竞争状态抗铁磁嵌套和链状态的单轴嵌套。我们还发现，当链状态的平坦带底部通过固定平面状态掺杂时，配对强度会大大增强。 $ f $ - 波配对对称性可以在以后的YBCO丘陵中实现，在将来的实验中，可以将链和平面状态之间的自掺杂机制最小化，以便只能选择性地将链状态选择性地掺杂。
We perform a numerical simulation of a three-band Hubbard model with two CuO$_2$ planes and a single CuO chain layer for YBCO cuprates. The spin-fluctuation mediated pairing interaction is computed within the multiband random-phase approximation, and its pairing eigenvalues and eigenfunctions are solved as a function of chain state filling factor $n_c$. We find that for the intrinsic value of $n_c$ in YBCO samples, one obtains the usual $d$-wave pairing symmetry. However, if we dope the chain layers with holes, while keeping the plane states doping fixed, the leading pairing symmetry solution becomes an unconventional $f$-wave symmetry. The mechanism behind the $f$-wave pairing is the competition between the plane states antiferromagnetic nesting and chain states' uniaxial nesting. We also find that the pairing strength is strongly augmented when the flat band bottom of the chain state passes the Fermi level for a fixed plane states doping. The $f$-wave pairing symmetry can be realized in YBCO cuprates in future experiments where the self-doping mechanism between the chain and plane states can be minimized so that only chain state can be selectively hole doped.
