Articles you may be interested inLarge magnetocaloric effect with a wide working temperature span in the R2CoGa3 (R=Gd, Dy, and Ho) compounds Large magnetocaloric effects over a wide temperature range in MnCo1−xZnxGe Magnetocaloric effect of Ho-, Dy-, and Er-based bulk metallic glasses in helium and hydrogen liquefaction temperature range Appl.The compound Ho 2 In exhibits two successive magnetic phase transitions: a spin-reorientation transition at T SR = 32 K and a magnetic-ordering transition at T C = 85 K. The maximum reversible −⌬S M values are 6.3 and 11.2 J/kg K at T SR and T C , respectively, for a field change of 5 T. These two −⌬S M peaks with the same sign are partly overlapping, which results in a wide temperature interval with appreciable magnetocaloric effect. The results on Ho 2 In indicate that materials with successive SR and magnetic-ordering transitions may constitute an important new class of magnetic refrigerants since they work in a wider temperature range than the conventional refrigerant materials.

A large reversible negative magnetic-entropy change ⌬S M has been observed in TbCoC 2 , accompanied by a second-order phase transition at 28 K. The maximum value of −⌬S M is 15.3 J kg −1 K −1 at 30 K for a magnetic-field change from 0 to 5 T, with the refrigerant capacity of 354 J kg −1. In particular, also the large −⌬S M max of 7.8 J kg −1 K −1 , is obtained for a small field change from 0 to 2 T. The large reversible ⌬S M and the high reversible refrigerant capacity in low magnetic field indicate that TbCoC 2 may be a promising candidate for magnetic refrigeration at low temperatures.

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