Direct observation of heavy quasiparticles in the Kondo lattice CeIn3

Authors :: Zhang, Y.
Feng, W.
Lou, X.
Yu, T. L.
Zhu, X. G.
Tan, S. Y.
Yuan, B. K.
Liu, Y.
Lu, H. Y.
Xie, D. H.
Liu, Q.
Zhang, W.
Luo, X. B.
Huang, Y. B.
Luo, L. Z.
Zhang, Z. J.
Lai, X. C.
Chen, Q. Y.
Publication Year :: 2018
Abstract: The electronic structure of the Kondo lattice CeIn3 has been studied by on-resonant angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. A weakly dispersive quasiparticle band has been observed directly with an energy dispersion of 4 meV by photoemission, implying the existence of weak hybridization between the f electrons and conduction electrons. The hybridization is further confirmed by the formation of the hybridization gap revealed by temperature-dependent scanning tunneling spectroscopy. Moreover, we find the hybridization strength in CeIn3 is much weaker than that in the more two-dimensional compounds CeCoIn5 and CeIrIn5. Our results may be essential for the complete microscopic understanding of this important compound and the related heavy-fermion systems.<br />Comment: 17pages, 5 figures