Three-dimensional Ising Ferrimagnetism of Cr-Fe-Cr trimers in FeCr2Te4

Abstract

We carried out a comprehensive study of magnetic critical behavior in single crystals of ternary chalcogenide FeCr${}_2$Te${}_4$ that undergoes a ferrimagnetic transition below $T_c$ $\sim$ 123 K. Detailed critical behavior analysis and scaled magnetic entropy change indicate a second-order ferrimagentic transition. Critical exponents $\beta =0.30(1)$ with $T_c=122.4(5)$ K, $\gamma =1.22(1)$ with $T_c=122.8(1)$ K, and $\delta =4.24(2)$ at $T_c$ $\sim$ 123 K suggest that the spins approach three-dimensional Ising ($\beta$ = 0.325, $\gamma$ = 1.24, and $\delta$ = 4.82) model coupled with the attractive long-range interactions between spins that decay as $J(r)\approx r^{-4.88}$. Our results suggest that the ferrimagnetism in FeCr${}_2$Te${}_4$ is due to itinerant ferromagnetism among the antiferromagnetically coupled Cr-Fe-Cr trimers.

Accepted in PRB

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