The ternary compound EuPtP exhibits two valence transitions at T 1 = 235 K and T 2 = 190 K. In order to examine a field-induced valence transition of Eu, we synthesized EuPtP 1-x As x compounds with 0.05 ≤ x ≤ 0.5 and studied the magnetic and valence behavior. The substitution of As for P increases the lattice volume linearly and decreases both valence transition temperatures, T 1 and T 2, in contrast to the behavior under external pressures. The magnetization process in a pulsed magnetic field revealed that EuPtP 0.5As 0.5 exhibits an onset of metamagnetic transition above 50 T with a large hysteresis, which evidences a first-order field-induced valence transition. The analysis of the magnetization curves of x = 0.5 at various temperatures has demonstrated that the field-induced transition is essentially the same as the transition induced by temperature at T 1.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics