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Journal Article

Intermediate valence and Kondo effect in Ce1−xScxAl2

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Ruderer, E., Schefzyk, R., Biesenkamp, H., Klämpke, W., Horn, S., & Steglich, F. (1984). Intermediate valence and Kondo effect in Ce1−xScxAl2. Journal of Magnetism and Magnetic Materials, 45(2-3), 219-228. doi:10.1016/0304-8853(84)90010-6.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-C2BF-8
Results of lattice parameter, thermal expansion, thermopower and magnetic susceptibility measurements are reported for Ce1 − xScxAl2, a system exhibiting a solubility gap over a wide composition range. Two isostructural phases are identified within the gap. For the Sc-rich systems, both phases contain intermediate valent (IV) Ce ions, whereas in the Ce-rich systems (x < 0.5), a low-volume IV phase coexists with a high-volume phase containing Ce3+ ions. The temperature-induced overall valence change of the IV ions amounts to 15–20%. A factor-of-three increase of the spinfluctuation temperature is found upon increasing the Sc concentration from x = 0.5 to 0.95. For the Ce-rich systems, we have discovered a hitherto not known “Kondo anomaly” in the temperature dependence of the thermal expansivity.