论文标题
在高纯度lanio $ _3 $中观察反铁磁量子临界点
Observation of an antiferromagnetic quantum critical point in high-purity LaNiO$_3$
论文作者
论文摘要
在稀土钙钛矿镍盐中，Lanio $ _3 $（LNO）是一个例外。虽然前者具有绝缘和抗铁磁基态，但LNO仍然是金属和非磁性的，直至最低的温度。据信，lno是一种奇怪的金属，正处于抗磁磁不稳定性的边缘。我们的工作表明LNO是一种量子临界金属，接近抗铁磁量子临界点（QCP）。 LNO中的QCP行为表现在具有前所未有的高纯度的外延薄膜中。我们发现，LNO在低温下的电阻率的温度和磁场依赖性与弱混乱型电荷载体的散射和抗磁性性质的量子波动一致。此外，我们发现引入少量的磁杂质在质量上改变了LNO的磁转运性能，在某些抗铁磁QCP附近的某些重绒毛围质晶状体系统中发现了类似于发现的磁杂质。
Amongst the rare-earth perovskite nickelates, LaNiO$_3$ (LNO) is an exception. While the former have insulating and antiferromagnetic ground states, LNO remains metallic and non-magnetic down to the lowest temperatures. It is believed that LNO is a strange metal, on the verge of an antiferromagnetic instability. Our work suggests that LNO is a quantum critical metal, close to an antiferromagnetic quantum critical point (QCP). The QCP behavior in LNO is manifested in epitaxial thin films with unprecedented high purities. We find that the temperature and magnetic field dependences of the resistivity of LNO at low temperatures are consistent with scatterings of charge carriers from weak disorder and quantum fluctuations of an antiferromagnetic nature. Furthermore, we find that the introduction of a small concentration of magnetic impurities qualitatively changes the magnetotransport properties of LNO, resembling that found in some heavy-fermion Kondo lattice systems in the vicinity of an antiferromagnetic QCP.
