Abstract
Angular resolved ultraviolet photoelectron spectroscopy is presented for the (001) surface of the ternary heavy fermion compound CeNi2Ge2. The samples are atomically clean and well-ordered thin films grown on a W(110) substrate under UHV-condition. The temperature was varied between 10 K and 300 K. The spectra were excited by means of HeI light (hν=21.2 eV). An enhanced intensity near the Fermi edge is observed at low temperatures for this excitation energy. With the variation of the detection angle, not only a change of the intensity but also of the position of the signal near the Fermi edge was observed. Furthermore the work function is drastically lowered, exhibiting an unusually high positive temperature coefficient of about 0.65 meV/K.
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