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We investigate the electronic structure of a novel Kondo lattice systemCeCuX2 (X = As/Sb) employing high resolution depth-resolved photoemissionspectroscopy of high quality single crystalline materials. CeCuSb2 and CeCuAs2represent different regimes of the Doniach phase diagram exhibiting Kondo-liketransport properties and CeCuSb2 is antiferromagnetic (TN ~ 6.9 K) whileCeCuAs$_2$ does not show long-range magnetic order down to the lowesttemperature studied. In this study, samples were cleaved in ultrahigh vacuumbefore the photoemission measurements and the spectra at different surfacesensitivity establish the pnictogen layer having squarenet structure as theterminated surface which is weakly bound to the other layers. Cu 2p and As 2pspectra show spin-orbit split sharp peaks along with features due to plasmonexcitations. Ce 3d spectra exhibit multiple features due to the hybridizationof the Ce 4f/5d states with the valence states. While overall lineshape of thebulk spectral functions look similar in both the cases, the surface spectra arevery different; the surface-bulk difference is significantly weaker in CeCuAs2compared to that observed in CeCuSb2. A distinct low binding energy peak isobserved in the Ce 3d spectra akin to the scenario observed in cuprates andmanganites due to the Zhang-Rice singlets and/or high degree of itineracy ofthe conduction holes. The valence band spectra of CeCuSb$_2$ manifest highlymetallic phase. In CeCuAs2, intensity at the Fermi level is significantly smallsuggesting a pseudogap-type behavior. These results bring out an interestingscenario emphasizing the importance and subtlety of hybridization physicsunderlying the exoticity of this novel Kondo system.

Complexity in the hybridization physics revealed by depth-resolved  photoemission spectroscopy of single crystalline novel Kondo lattice systems,  CeCuX$_2$ (X = As/Sb)