ARPES/STM study of the surface terminations and 5f -electron character in URu2Si2
| Autor: | Q. Q. Hao, Wen Zhang, Yong Liu, Xinchun Lai, Yaobo Huang, Yong-Ju Zhang, Shiyong Tan, Donghua Xie, Xie-Gang Zhu, Haiyan Lu, Qiuyun Chen, Wei Feng |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Surface (mathematics) Condensed matter physics Photoemission spectroscopy Scanning tunneling spectroscopy Angle-resolved photoemission spectroscopy 02 engineering and technology Electronic structure Electron 021001 nanoscience & nanotechnology 01 natural sciences Hidden order Character (mathematics) 0103 physical sciences 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.115121 |
| Popis: | Hidden order in ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ has remained a mystery that is now entering its fourth decade. The importance of resolving the nature of the hidden order has stimulated extensive research. Here we present a detailed characterization of different surface terminations in ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ by angle-resolved photoemission spectroscopy, in conjunction with scanning tunneling spectroscopy and dynamical mean-field theory calculations that may unveil a piece of this puzzle. The U-terminated surface is characterized by an electronlike band around the $\overline{X}$ point, while a holelike band characterizes the Si-terminated surface. We also investigate the temperature evolution of the electronic structure around the $\overline{X}$ point from 11 up to 70 K, and do not observe any abrupt change of the electronic structure around the coherence temperature (55 K). The $f$ spectral weight gradually weakens upon increasing temperature; still some $f$ spectral weight can be found above this temperature. Our results suggest that surface terminations in ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ are an important issue to be taken into account in future work. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|