We present a comprehensive analysis of the critical behavior of ${\mathrm{Sm}}_7{\mathrm{Pd}}_3$ in the vicinity of its second-order magnetoelastic transition at $T_{\mathrm{c}}=173\mathrm{K}$. The critical exponents (CEs) $\beta$ and $\gamma$, determined using both the standard convergence procedure and the average normalized slope (ANS) method, diverge at $T_{\mathrm{c}}$–-a characteristic typically associated with first-order transitions. Notably, none of the established universality classes satisfactorily describe the critical behavior of ${\mathrm{Sm}}_7{\mathrm{Pd}}_3$, and we discuss the possible origins of this deviation in the context of the strong spin-lattice coupling intrinsic to the sample. We emphasize the importance of accurately selecting the critical temperature and magnetic field ranges to ensure robust critical behavior analysis, and propose a quantitative approach to assess the reliability of the extracted CEs. Additionally, we demonstrate that in the ANS method, the critical exponents $\beta$ and $\gamma$ should be calculated separately using data for $T⩽T_{\mathrm{c}}$ and $T⩾T_{\mathrm{c}}$, respectively. Our findings underscore the need for a revised theoretical framework to accurately describe second-order magnetoelastic transitions.

Close

PrevNext

View figure in article

• Magnetic interactions
• Magnetic order
• Magnetic phase transitions
• Magnetism
• Ferrimagnets
• Ferromagnets
• Spin glasses
• Magnetization measurements