Faculty of Physics: Research Data

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Browsing Faculty of Physics: Research Data by Person "Geibel, Christoph"

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  • Research Data
    Towards a critical endpoint in the valence fluctuating Eu(Rh1-xCox)2Si2 system
    2025-10-15
    Walther, Franziska Leonie 
    Ocker, Michelle 
    Caroca-Canales, Nubia
    Kraiker, Alexej
    Seiro, Silvia S.
    Geibel, Christoph
    Kliemt, Kristin 
    Krellner, Cornelius 
    We report on the successful single crystal growth of pure EuRh${_2}$Si${_2}$ and of Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$ with $x\leq0.23$ by the flux method. Through Co substitution, EuRh$_2$Si$_2$ can be tuned from stable antiferromagnetism via a valence-transition state towards the valence-crossover regime. From magnetization measurements, we constructed a $B - T$ phase diagram for EuRh${_2}$Si${_2}$ comprising multiple magnetic phases and showing a sizable magnetic anisotropy within the basal plane of the tetragonal unit cell. This indicates a complex antiferromagnetic ground state for $x=0$. By applying positive chemical pressure through the substitution series Eu(Rh$_{1-x}$Co$_{x}$)$_2$Si$_2$, a sharp temperature-induced first-order phase transition is observed in magnetization, resistivity and heat capacity for \textcolor{blue}{0.081 $\leq$ $x$ $\leq$ 0.126}. The critical end point of this valence transition is located in the phase diagram in the vicinity of \textcolor{blue}{0.126 $
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