Abstract
The magnetic susceptibility and high-field magnetization have been measured for the intermediate valence system Eu(${\mathrm{Pd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Pt}}_{\mathrm{x}}$${)}_{2}$${\mathrm{Si}}_{2}$ with 0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.15. A first-order valence transition is observed for all the compounds under high field of 100 T at low temperatures. This valence transition is of first order accompanied with a large hysteresis, which is in contrast to a continuous valence change against temperature. Based on the interconfigurational fluctuation (ICF) model, the temperature- and field-induced valence transitions are discussed. It is found that a first-order valence transition can be induced by magnetic field, even if the system shows a continuous valence transition against temperature. Metamagnetic behavior at finite temperatures is also understood qualitatively by the ICF model.
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