Abstract
The EuNi 2(Si 1− x Ge x ) 2 system exhibits a temperature- and field-induced valence transition from Eu 3+ to Eu 2+ in the concentration range 0.75⩽ x⩽0.85. In this study, we performed magnetization measurements on compounds with 0.5⩽ x⩽0.75 in ultra-high fields up to 300 T generated by explosive compression of magnetic flux. We observed a jump of the magnetization, indicating a field-induced valence change from Eu 3+ to Eu 2+ for each compound. The critical field increases linearly with decreasing x and reaches a value of 225 T for x=0.5.
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