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Experimental observation of the significant difference between surface and bulk Kondo processes in Kondo lattice YbCu₂Si₂
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Experimental observation of the significant difference between surface and bulk Kondo processes in Kondo lattice YbCu₂Si₂
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Synchrotron-based angle-resolved photoemission spectroscopy was employed to investigate the temperature evolution of the Yb 4f spectral for surface and bulk in the Kondo lattice YbCu$_2$Si$_2$.Our study quantitatively distinguishes between the surface and bulk hybridization processes, revealing that the onset temperatures for both surface and bulk hybridization processes are significantly higher than the Kondo temperature. Additionally, we found that the effective surface Kondo temperature is much lower than that of the bulk. These findings offer valuable insights into the understanding of heavy fermion physics.
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