Abstract
Antiparallel coupling of the impurity states with the conduction electronicstates leads to interesting phenomena in solid – the magnetic moments arecompletely compensated leading to a non-magnetic Fermi liquid phase in amagnetic material – this is known as Kondo effect. Such coupled electronicstates appear as a sharp feature at the chemical potential, called Kondoresonance feature. Employing high resolution photoemission spectroscopy, westudied the evolution of Kondo resonance feature in RB6 (R = La, Ce, Pr, Nd)and Ce2(RhCo)Si3 as a function of temperature that helps to probe thiseffect as a function of 4f binding energy and 4f-conduction electronhybridization strength. Experimental spectra of Kondo systems reveal thegrowth of multiple Kondo resonance features with decreasing temperaturerelative to the uncompensated local moment contributions that experimentallydemonstrates the Kondo effect. Ironically, the features near Fermi level inthe valence band spectra of PrB6, NdB6, Ce2RhSi3 etc also exhibit similartemperature dependence signalling the presence of Kondo compensation effectalthough their bulk physical properties do not exhibit Kondo effect.
