Electronic structure of heavy fermion system CePt_2In_7 from angle-resolved photoemission spectroscopy

• Published in: 中国物理B：英文版 2017, Vol.26 (7), p.352-362
• Main Author: 沈兵 俞理 刘凯 吕守鹏 贾小文 E D Bauer J D Thompson 张艳 王晨露 胡成 丁颖 孙璇 胡勇 刘静 高强 赵林 刘国东 许祖彦 陈创天 卢仲毅 周兴江
• Format: Article
• Language: English
• Subjects: 子体; 电子结构; 电子能谱测量; 能带结构; 费米面; 超导电性; 重费米子; 高分辨率
• ISSN: 1674-1056; 2058-3834

We have carried out high-resolution angle-resolved photoemission measurements on the Ce-based heavy fermion compound CePt_2In_7 that exhibits stronger two-dimensional character than the prototypical heavy fermion system CeCoIn_5.Multiple Fermi surface sheets and a complex band structure are clearly resolved. We have also performed detailed band structure calculations on CePt_2In_7. The good agreement found between our measurements and the calculations suggests that the band renormalization effect is rather weak in CePt_2In_7. A comparison of the common features of the electronic structure of CePt_2In_7 and CeCoIn_5 indicates that CeCoIn_5 shows a much stronger band renormalization effect than CePt_2In_7. These results provide new information for understanding the heavy fermion behaviors and unconventional superconductivity in Ce-based heavy fermion systems.