论文标题
金属镍中的相互交织的密度波
Intertwined density waves in a metallic nickelate
论文作者
论文摘要
镍是一类丰富的材料，从绝缘磁铁到超导体。但是对于化学计量材料，对于大多数晚期过渡金属氧化物而言，绝缘行为是标准。值得注意的例外是3D Perovskite Lanio $ _3 $，非常规的顺磁金属和分层的Ruddlesden-Popper阶段R $ _4 $ ni $ _3 $ _3 $ o $ $ $ _ {10} $，（R = la，pr，nd）。后者特别有趣，因为它们表现出异常的金属对金属过渡。在这里，我们证明了这种过渡是由具有电荷和磁特征的不相互密度的波浪引起的，在铬金属中看到的金属密度波与通常在分层镍盐中发现的绝缘条纹之间的行为中间。因此，r $ _4 $ ni $ _3 $ o $ _ {10} $，这似乎是3D过渡金属氧化物中流动旋转密度波的第一个已知示例，代表了3D金属lanio $ _3 $ quassi-nickel Valence的3D金属lanio $ _3 r $ _ {2-x} $ sr $ _x $ nio $ _4 $在低镍价处。
Nickelates are a rich class of materials, ranging from insulating magnets to superconductors. But for stoichiometric materials, insulating behavior is the norm, as for most late transition metal oxides. Notable exceptions are the 3D perovskite LaNiO$_3$, an unconventional paramagnetic metal, and the layered Ruddlesden-Popper phases R$_4$Ni$_3$O$_{10}$, (R=La, Pr, Nd). The latter are particularly intriguing because they exhibit an unusual metal-to-metal transition. Here, we demonstrate that this transition results from an incommensurate density wave with both charge and magnetic character that lies intermediate in behavior between the metallic density wave seen in chromium metal and the insulating stripes typically found in layered nickelates. As such, R$_4$Ni$_3$O$_{10}$, which appears to be the first known example of an itinerant spin density wave in a 3d transition metal oxide, represents an important bridge between the paramagnetism of 3D metallic LaNiO$_3$ at higher nickel valence and the polaronic behavior of quasi-2D R$_{2-x}$Sr$_x$NiO$_4$ at lower nickel valence.
