CrFe2Ge2: Investigation of novel ferromagnetic material of Fe13Ge8-type crystal

P. L. S. Cambalame; B. J. C. Vieira; J. C. Waerenborgh; P. S. P. da Silva; J. A. Paixão

doi:10.1016/j.jmmm.2025.173745

paper

CrFe2Ge2: Investigation of novel ferromagnetic material of Fe13Ge8-type crystal

arXiv:2512.13611 · doi:10.1016/j.jmmm.2025.173745

Abstract

We successfully synthesized a novel intermetallic compound $CrF e_{2} G e_{2}$ with the $F e_{13} G e_{8}$ -type crystal structure. A structural study is presented combining single-crystal X-ray diffraction and Mössbauer spectroscopy analysis, confirming the presence of two distinct Fe sublattices. $CrF e_{2} G e_{2}$ exhibits a metallic ferromagnetic state with $T_{C} \approx 200 K$ . This material does not follow the usual $M^{2} \propto H / M$ Arrott law, rather a modified Arrott law is obeyed in this material. The critical exponents determined from detailed analysis of modified Arrott plots were found to be $β = 0.392$ , $γ = 1.309$ and $δ = 4.26$ obtained from the critical isotherm at $T_{C} = 200 K$ . Self-consistency and reliability of the critical exponent analysis were verified by the Widom scaling law and scaling equations. Using the results from renormalization group calculation, the critical behavior of $CrF e_{2} G e_{2}$ is akin to that of a $d = 3, n = 3$ ferromagnet in which the magnetic exhange distance is found to decay as $J (r) \approx r^{- 4.86}$ with long-range magnetic coupling. The evaluated Rhodes-Wohlfarth ratio of $\sim 3$ points to an itinerant ferromagnetic ground state. Low-temperature measurements of resistivity, $p (T)$ , and specific heat, $C_{P} (T)$ , reveal a pronounced contribution from electron-magnon scattering.

arXiv commentAccepted for publication in the Journal of Magnetism and Magnetic Materials

CrFe2Ge2: Investigation of novel ferromagnetic material of Fe13Ge8-type crystal

Abstract

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