Electron Doping of the Iron-Arsenide Superconductor CeFeAsO Controlled by Hydrostatic Pressure.
Electron Doping of the Iron-Arsenide Superconductor CeFeAsO Controlled by Hydrostatic Pressure.
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DOI：
10.1103/physrevlett.125.207001
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发表时间：
2020-11
影响因子：
8.6
通讯作者：
K. Mydeen;A. Jesche;A. Jesche;K. Meier-Kirchner;Ulrich S. Schwarz;C. Geibel;H. Rosner;M. Nicklas
中科院分区：
文献类型：
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作者：
K. Mydeen;A. Jesche;A. Jesche;K. Meier-Kirchner;Ulrich S. Schwarz;C. Geibel;H. Rosner;M. Nicklas
在铁磷属元素化物材料CeFeAsO中，不仅Fe磁矩，而且Ce序的局部4f磁矩在低温下是反铁磁的。我们阐明了Ce在超导电性出现中的特殊作用。而施加压力抑制铁SDW有序温度单调高达4 GPa，Ce-4f磁性稳定，直到这两种类型的磁秩序突然消失和一个狭窄的SC圆顶的发展。随着压力的进一步增加，近藤晶格系统的电阻率特性变得越来越明显。这表明超导性的出现与磁序的消失和Ce-4f矩的近藤屏蔽的开始有关。
In the iron-pnictide material CeFeAsO not only the Fe moments, but also the local 4f moments of the Ce order antiferromagnetically at low temperatures. We elucidate on the peculiar role of the Ce on the emergence of superconductivity. While application of pressure suppresses the iron SDW ordering temperature monotonously up to 4 GPa, the Ce-4f magnetism is stabilized until both types of magnetic orders disappear abruptly and a narrow SC dome develops. With further increasing pressure characteristics of a Kondo-lattice system become more and more apparent in the electrical resistivity. This suggests a connection of the emergence of superconductivity with the extinction of the magnetic order and the onset of Kondo screening of the Ce-4f moments.