Coexistence of inverse and normal magnetocaloric effect in A-site ordered NdBaMn2O6

Q. Zhang (1) , François Guillou (1) , A. Wahl (1) , Yohann Bréard (1) , Vincent Hardy (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

NdBaMn2O6 exhibits a sequence of two following magnetic transitions: a second-order paramagnetic-ferromagnetic transition at TC = 290 K, followed by a first-order ferromagnetic-antiferromagnetic transition around TN = 210 K, leading to normal and inverse magnetocaloric effects (MCE), respectively. For ΔB = 5 T, the combined |−ΔSMmax| around TC and TN is found to be 2.5 J/kg K and 1.4 J/kgK, respectively. Moreover, the presence of these two −ΔSM peaks spanning over a broad range of temperature leads to a remarkably wide working temperature region, yielding a significant performance in terms of refrigerant efficiency. The present study demonstrates that adjusting the degree of A-site cation ordering in perovskite oxides is an efficient strategy to induce room-temperature MCE.

Mots clés: PIEnergie

Q. Zhang, François Guillou, A. Wahl, Yohann Bréard, Vincent Hardy. Coexistence of inverse and normal magnetocaloric effect in A-site ordered NdBaMn2O6. Applied Physics Letters, 2010, 96 (24), pp.242506. ⟨10.1063/1.3453657⟩. ⟨hal-00686512⟩