Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors
- Liu, Z.K.
- Yi, M.
- Zhang, Y.
- Hu, J.
- Yu, R.
- Zhu, J.-X.
- He, R.-H.
- Chen, Y.L.
- Hashimoto, M.
- Moore, R.G.
- Mo, S.-K.
- Hussain, Z.
- Si, Q.
- Mao, Z.Q.
- Lu, D.H.
- Shen, Z.-X.
DOIAbstract
The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron correlations. To gauge the correlation strength, we performed a systematic angle-resolved photoemission spectroscopy study on the iron chalcogenide series Fe1+ySexTe1−x (0<x<0.59), a model system with the simplest structure. Our measurement reveals an incoherent-to-coherent crossover in the electronic structure as the selenium ratio increases and the system evolves from a weakly localized to a more itinerant state. Furthermore, we found that the effective mass of bands dominated by the dxy orbital character significantly decr...
Add to ORKG