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Magnetic refrigeration based on the magnetocaloric effect (MCE) is an environment-friendly, high-efficiency technology. It has been believed that a large MCE can be realized in the materials with a first-order magnetic transition (FOMT). Here, we found that TlFe 3 Te 3  is a ferromagnetic metal with a first-order magnetic transition occurring at Curie temperature  T   C   = 220 K. The maximum values of magnetic entropy change (Δ    ) along the crystallographic  c -axis, estimated from the magnetization data, reach to 5.9 J kg −1 K −1  and 7.0 J kg −1  K −1  for the magnetic field changes, Δ H  = 0–1 T and 0–2 T, respectively, which is significantly larger than that of MCE materials with a second-order magnetic transition (SOMT). Besides the large Δ S   M  , the low-level both thermal and field hysteresis make TlFe 3 Te 3  compound an attractive candidate for magnetic refrigeration. Our findings should inspire the exploration of high performance new MCE materials.

Large low field magnetocaloric effect in first-order phase transition compound TlFe3Te3 with low-level hysteresis