Direct observation of heavy quasiparticles in the Kondo lattice CeIn3
cond-mat.str-el
/ Authors
Y. Zhang, W. Feng, X. Lou, T. L. Yu, X. G. Zhu, S. Y. Tan, B. K. Yuan, Y. Liu, H. Y. Lu, D. H. Xie
and 8 more authors
Q. Liu, W. Zhang, X. B. Luo, Y. B. Huang, L. Z. Luo, Z. J. Zhang, X. C. Lai, Q. Y. Chen
/ 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.