Photoemission insight into the heavy-fermion behavior in Ce0.85Yb0.15CoIn5
Photoemission insight into the heavy-fermion behavior in Ce0.85Yb0.15CoIn5
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光电发射洞察 Ce0.85Yb0.15CoIn5 中的重费米行为
DOI：
10.1103/physrevb.101.045105
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发表时间：
2020
影响因子：
3.7
通讯作者：
QY et al.
中科院分区：
文献类型：
--
作者：
Chen;QY et al.
稀土基重费米子化合物的能量尺度相对较小，可以通过施加压力、磁场或化学掺杂来容易地调节。用Yb取代Ce的稀土位置，可以平稳地抑制超导的基态，而不出现明显的量子临界点，并观察到一些显著的现象。电子结构的微小变化被认为主导了这些化合物的基本物理学。在本研究中，我们提供了一个电子结构的研究与超导状态，但抑制转变温度的角分辨光电子能谱，并与结果进行了比较。我们发现，在低温下，电子是巡游的，形成弱色散的杂化带。更有趣的是，电子和传导电子之间的杂化强度与。进一步的温度依赖性测量提供了该化合物中电子的定域-巡游交叉行为的直接证据。
The energy scales in rare-earth-based heavy-fermion compounds are relatively small, which can be easily tuned by applying pressure, magnetic field, or chemical doping. By substituting Yb for Ce on the rare-earth site, the ground state of superconductivity can be smoothly suppressed without the appearance of an apparent quantum critical point, and a number of remarkable phenomena have been observed. The slight changes in the electronic structure are supposed to dominate the underlying physics in these compounds. In the present study, we provide an electronic structure study ofwith a superconducting state but suppressed transition temperature by angle-resolved photoemission spectroscopy, and the results are compared with. We find that theelectrons inare itinerant, forming the weakly dispersive hybridized band at low temperature. More interestingly, the hybridization strength between theelectrons and conduction electrons inis comparable with. Further temperature-dependent measurements provide direct evidence of the localized-to-itinerant crossover behavior of theelectrons in this compound.