Abstract
In the present work, we have studied the structural and magnetic properties of the compounds PrCo2Cu3, PrCo2.5Cu2.5 and PrCo3Cu2 as well as their spin reorientation transition and magnetocaloric behavior. All three compounds crystallize in the hexagonal CaCu5-type structure. The lattice parameters increase when copper replaces cobalt. The temperature dependence of the magnetization has been determined at low and high temperatures. It revealed that the Curie temperature decreases from ∼ 1000 K to 310 K after the substitution of cobalt by copper (PrCo2Cu3). For the copper-rich compound, a merging of the transition from the planar ferromagnetic state to the axial ferromagnetic one and the transition from the ferromagnetic state to the paramagnetic one is observed. A constant entropy variation is observed over a wide temperature range centered around room temperature. It results from the merging of the entropy measured around the spin reorientation temperature and that measured around Curie temperature.
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