Study on valence transition and valence order transition in Eu-based compounds

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We have examined unstable 4f electrons (valence states) and its related behaviors in Eu-based compounds. We discovered new valence transition under pressure of about 1GPa in EuRh2Si2. This transition is found to be very sensitive to magnetic field. Thus, we are successful in observing magnetic-field-induced valence transition in a field of 7T, which is much lower than before.In addition, we have focused on EuPtP, which intriguingly exhibits two valence transitions (T1 and T2) accompanied by valence order transitions. We could synthsize EuPtP1-xAsx up to x=0.7 and examined x-dependence of transition temperatures. For x<=0.4, the two transitions are observed, while for 0.6<=x<=0.5 only one trantision corresponding to T1 is observed. For x=0.7, there are no transitions.These results means that we have found new information on valence instability of Eu-based compounds that leads to future research.