论文标题
$ r $ srnio $ _4 $中的费用不成比例和纳米阶段分离
Charge disproportionation and nano phase separation in $R$SrNiO$_4$
论文作者
论文摘要
我们已经成功种植了厘米大小的分层$ r $ srnio $ _4 $单晶在浮动区技术的高氧气压力下。这使我们能够执行中子散射实验，在该实验中，我们观察到接近$ \ sim $ 77 K的四分之一智能磁峰，并伴随着陡峭的向上分散旋转激发。在高频NI-O键拉伸声子分散体中，可以观察到棋盘调制的传播矢量的软化。与我们的自旋波模拟一起，这些观察结果表明，这种Ni $^{3+} $系统表现出电荷不成比例，并且电荷在纳米相分离场景中分离为棋盘板模式，而不是显示Jahn Teller效应。
We have successfully grown centimeter-sized layered $R$SrNiO$_4$ single crystals under high oxygen pressures of 120 bar by the floating zone technique. This enabled us to perform neutron scattering experiments where we observe close to quarter-integer magnetic peaks below $\sim$77 K that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni-O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. Together with our spin wave simulations these observations reveal that this Ni$^{3+}$ system exhibits charge disproportionation with charges segregating into a checkerboard pattern within a nano phase separation scenario rather than showing a Jahn-Teller effect.
