Abstract
151Eu-Mossbauer spectroscopy is used to study the ternary intermetallics EuM2Ge2 (M=Ni, Pd, Pt), in which Eu is divalent, and EuNi2Si2 as a trivalent reference system in the pressure range 0–31 GPa. In EuNi2Ge2 and EuPd2Ge2, one observes a valence transition from Eu2+ to Eu3+ around 5 and 25 GPa, accompanied by a change in isomer shift of 9.3 and 10.1 mm/s, respectively. These are the largest pressure-driven changes in isomer shift for151Eu-spectroscopy observed up to now.
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