论文标题
在LA $ _ {1.67} $ sr $ _ {0.33} $ nio $ _4 $的动态条纹阶段中，呼吸平面氧气子的巨型电子音波耦合
Giant electron-phonon coupling of the breathing plane oxygen phonons in the dynamic stripe phase of La$_{1.67}$Sr$_{0.33}$NiO$_4$
论文作者
论文摘要
掺杂的抗铁磁铁拥有大量的物理特性，并学习如何控制它们是凝结物理物理学的最大挑战之一。 la $ _ {1.7} $ sr $ _ {0.3} $ nio $ _4 $（lsno）是这种材料的经典示例。在低温下，通过SR将LA替换引入的孔中，将SR分离为线，以条纹形式形成磁有序域之间的边界。条纹在高温下变得动态性，但是LSNO仍然可以绝缘，大概是因为磁相关与电子波耦合之间的相互作用定位了电荷载体。在该系统中已经广泛研究了磁自由度，但是声子几乎完全没有探索。我们通过非弹性中子散射在LSNO中搜索了电子音波异常。在输入动态电荷条带相位时，调节Ni周围体积的平面Ni-O键拉伸模式的巨型重新归一化。其他声子对条纹融化的敏感性不大。呼吸模式的戏剧性过度阻尼表明，动态条纹相可能容纳小极性。我们认为，此功能将镍含量的电子偶联设置在镍中，除了呼吸声子没有过度阻尼的丘疹，并指出与巨大的磁耐磁力（CMR）锰的相似之处。
Doped antiferromagnets host a vast array of physical properties and learning how to control them is one of the biggest challenges of condensed matter physics. La$_{1.7}$Sr$_{0.3}$NiO$_4$ (LSNO) is a classic example of such a material. At low temperatures holes introduced via substitution of La by Sr segregate into lines to form boundaries between magnetically ordered domains in the form of stripes. The stripes become dynamic at high temperatures, but LSNO remains insulating presumably because an interplay between magnetic correlations and electron-phonon coupling localizes charge carriers. Magnetic degrees of freedom have been extensively investigated in this system, but phonons are almost completely unexplored. We searched for electron-phonon anomalies in LSNO by inelastic neutron scattering. Giant renormalization of plane Ni-O bond-stretching modes that modulate the volume around Ni appears on entering the dynamic charge stripe phase. Other phonons are a lot less sensitive to stripe melting. Dramatic overdamping of the breathing modes indicates that dynamic stripe phase may host small polarons. We argue that this feature sets electron-phonon coupling in nickelates apart from that in cuprates where breathing phonons are not overdamped and point out remarkable similarities with the colossal magnetoresistance (CMR) manganites.
