Abstract
The 84.3 keV Mössbauer transition in170Yb was used to investigate the intermediate valent intermetallic compound YbCuAl at pressures up to 130 kbar and in the temperature range between 1.6 K and 77 K. The electric quadrupole interaction parameters |eQV zz | and η, as well as their temperature variation are drastically dependent on pressure: |eQV zz | is at 4.2 K larger by almost a factor of three at 130 kbar when compared to ambient pressure. On the other hand, |eQV zz | drops by more than a factor of two at 130 kbar when the temperature is raised from 1.6 K to 77 K. A much smaller temperature dependence of quadrupole coupling is present at ambient pressure. Both these effects give strong evidence for a valence transition towards the 4f 13 (Yb3+) configuration under applied pressure. At 4.2 K this transition is completed near ∼50 kbar. No magnetic order could be detected down to 1.6 K over the whole pressure range. Some line broadening is observed at high pressures and low temperatures which most probably is related to paramagnetic relaxation phenomena and supports the claim that the Yb ion is in a magnetic state under these conditions.
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Schöppner, M., Moser, J., Kratzer, A. et al. Changes of valence state of Yb in YbCuAl at high pressure: A Mössbauer study. Z. Physik B - Condensed Matter 63, 25–32 (1986). https://doi.org/10.1007/BF01312574
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DOI: https://doi.org/10.1007/BF01312574