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Direct observation of heavy quasiparticles in the Kondo lattice CeIn3

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arxiv 1801.01214 v1 pith:MU5FVTDW submitted 2018-01-04 cond-mat.str-el

Y. Zhang , W. Feng , X. Lou , T. L. Yu , X. G. Zhu , S. Y. Tan , B. K. Yuan , Y. Liu
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H. Y. Lu D. H. Xie Q. Liu W. Zhang X. B. Luo Y. B. Huang L. Z. Luo Z. J. Zhang X. C. Lai Q. Y. Chen
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keywords hybridizationcein3spectroscopybeenelectronskondolatticephotoemission
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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.

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