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Photoinduced valence dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>EuNi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>Si</mml:mi><mml:mrow><mml:mn>0.21</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mrow><mml:mn>0.79</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> studied via time-resolved x-ray absorption spectroscopy
The photoinduced valence dynamics of ${\mathrm{EuNi}}_{2}{({\mathrm{Si}}_{0.21}{\mathrm{Ge}}_{0.79})}_{2}$ were investigated using time-resolved x-ray absorption spectroscopy for Eu ${M}_{5}$ edge. Through the pump-probe technique with synchrotron x-ray and Ti:sapphire laser pulses, a photoinduced valence transition was observed from ${\mathrm{Eu}}^{3+}$ to ${\mathrm{Eu}}^{2+}$. Because the lifetime of a photoinduced state can be up to 3 …