Photoemission-spectroscopy investigation of the chemical-pressure effect in Yb sub 1 minus x M x Al sub 2 ( M =Ca,Sc)
- Istituto di Fisica del Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy (IT)
- Dipartimento di Fisica dell'Universita, via Dodecaneso, Genova, Italy (IT)
- Istituto di Chimica Fisica dell'Universita, Corso Europa, Genova, Italy (IT)
We present photoemission results with uv and with x rays from a family of pseudobinary compounds obtained by partial substitution of Yb, with Ca or Sc, in the reference compound YbAl{sub 2}. The substitution with Ca gives rise to a decompression and the one with Sc a compression of the lattice. Ultraviolet photoemission shows the perturbation of the electron states due to chemical substitution; Sc introduces a {ital d} character extending up to about 3 eV below the Fermi level. The weights of the Yb{sup 3+} and Yb{sup 2+} multiplets given by x-ray photoemission are compared with the results from x-ray absorption; the two spectroscopies agree in YbAl{sub 2} while the relative weights Yb{sup 3+} versus Yb{sup 2+} from x-ray photoemission are definitely below the x-ray-absorption values in the compounds heavily substituted with Sc; this is interpreted as a photoemission final-state effect connected with the {ital d} character introduced by the substitution.
- OSTI ID:
- 5493055
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 43:15; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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