论文标题
并行旋转条纹及其与超导地面状态的共存，在la $ _ {1.6-x} $ _nd $ _ {0.4} $ _ {0.4} $ sr $ _x $ _x $ cuo $ _4 $中以最佳和高掺杂状态共存
Parallel Spin Stripes and Their Coexistance with Superconducting Ground States at Optimal and High Doping in La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$
论文作者
论文摘要
准二维量子磁力显然与基于丘陵的高t $ _c $超导性超导地面状态高度相关。三维，相称的长距离磁性顺序$ _2 $ _2 $ cuo $ _4 $迅速发展为准二维，与移动孔掺杂时的不一致的相关性，超导地面状态以及x的超导地面状态随着La $ _ $ _ $ _ {2-x $ _ $ _ $ _的$ _ $ _的$ _ $ _ $ _ $ _的$ _ $ _ $ _ $ _的$ _ $ _ $ _ $ _的$ _ $ _ $ _ 4超导体。长期以来，众所周知，这些系统中超导地面状态的发作与从x = 0.05以下的“对角线条纹”到上面的“平行条纹”的不相称的自旋顺序相吻合。然而，对于最佳和高掺杂水平下的自旋相关性知之甚少，超导性圆顶的末端。在这里，我们在LA $ _ {1.6-X} $ _ {1.6-x} $ nd $ _ {0.4} $ _x $ _x $ _x $ _4 $ x = 0.125、0.125、0.19、0.24和0.26的单一晶体上介绍新的弹性和非弹性中子散射测量。条纹相包裹在该系统中的所有超导地面状态。平行自旋条纹横跨0.05 <<0.26，速度尺寸迅速降低，x> 0.125的发作温度迅速降低。我们还表明，最佳掺杂X = 0.19的低能，平行自旋条波动显示动态光谱重量，随着温度降低，饱和以下，低于其超导t $ _C $。 X = 0.19的弹性顺序参数还显示了与超导性发作一致的平稳行为。这组观察结果声称，在高t $ _c $ cuprate超导率中，二维平行旋转条纹顺序和波动发挥了基础作用。
Quasi-two dimensional quantum magnetism is clearly highly correlated with superconducting ground states in cuprate-based High T$_c$ superconductivity. Three dimensional, commensurate long range magnetic order in La$_2$CuO$_4$ quickly evolves to quasi-two dimensional, incommensurate correlations on doping with mobile holes, and superconducting ground states follow for x as small as 0.05 in the La$_{2-x}$Sr$_x$/Ba$_x$CuO$_4$ family of superconductors. It has long been known that the onset of superconducting ground states in these systems is coincident with a remarkable rotation of the incommensurate spin order from "diagonal stripes" below x = 0.05, to "parallel stripes" above. However, little is known about the spin correlations at optimal and high doping levels, where the dome of superconductivity draws to an end. Here we present new elastic and inelastic neutron scattering measurements on single crystals of La$_{1.6-x}$Nd$_{0.4}$Sr$_x$CuO$_4$ with x = 0.125, 0.19, 0.24 and 0.26, and show that two dimensional, quasi-static, parallel spin stripes are observed to onset at temperatures such that the parallel spin stripe phase envelopes all superconducting ground states in this system. Parallel spin stripes stretch across 0.05 < < 0.26, with rapidly decreasing moment size and onset temperatures for x > 0.125. We also show that the low energy, parallel spin stripe fluctuations for optimally doped x = 0.19 display dynamic spectral weight which grows with decreasing temperature and saturates below its superconducting T$_c$. The elastic order parameter for x = 0.19 also shows plateau behavior coincident with the onset of superconductivity. This set of observations assert the foundational role played by two dimensional parallel spin stripe order and fluctuations in High T$_c$ cuprate superconductivity.
