Abstract
Magnetisation isotherms were measured for a number of (R,R′)Co 2 and (R, Y)Co 2 (R, R′=rare earths) compounds. A metamagnetic transition is observed just above the Curie temperature ( T C) of compounds having a first-order phase transition, i.e. ErCo 2, HoCo 2 and (Dy, Y)Co 2. The magnetic entropy change Δ S m shows a largest value of −11.8 J/mol K at 35 K for ErCo 2 and it decreases exponentially with increasing temperature. The obtained thermal variation of Δ S m is compared to that of RAl 2 and other intermetallic compounds. Giant magnetocaloric effects observed in RCo 2-based compounds are discussed in terms of the 4f(R)-localised spin, 3d(Co)-spin fluctuations as well as nature of the phase transition.
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