Spin-glass-like state and reversible room-temperature magnetocaloric effect in double distorted perovskites Nd(Cu$_{3–x}$Mn$_x$ )Mn$_4$O$_{12}$ - Laboratoire de cristallographie et sciences des matériaux Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2022

Spin-glass-like state and reversible room-temperature magnetocaloric effect in double distorted perovskites Nd(Cu$_{3–x}$Mn$_x$ )Mn$_4$O$_{12}$

Résumé

The preparation, complex magnetic properties and room-temperature magnetocaloric effect in Nd(Cu$_{3−x}$Mn$_x$)-Mn$_4$O$_{12}$ with cation distribution (Nd$^{3+}$)A(Cu$_{3−x}$$^{2+x}$Mn$_x$$^{3+}$)$_{A′}$(Mn$_{1+x}$$^{3+}$Mn$_{3−x}$$^{4+}$)$_B$O$_{12}$$^{2−}$($x$=1 and 1.5) have been reported. Both compounds show a sharp paramagnetic-ferromagnetic (FM) transition atTCof 300 and 280 K, respectively. The substitution of Cuby Mn at the A′site induces the emergence of a spin glass state below≈63 K forx= 1 and≈72 K forx= 1.5 compound. Anotherantiferromagnetic-like magnetic transition is also observed in both compounds at 23 and 28 K, respectively, which is discussed as theantiferromagnetic coupling between Nd$^{3+}$ at the A′ site and (Mn$^{3+}$/Mn$^{4+}$) at the B site. These two compounds exhibit room-temperature magnetocaloric effect. For a smallfield of 2 T, the maximum magnetic entropy changes$−$ΔS$_M$ are 1.5 J/kg K at 300 Kand 1.4 J/kg K at 280 K, respectively. Moreover, the$−$ΔS$_M$(T) curves show an asymmetric distribution, resulting in high refrigerantcapacity values for both compounds. We further demonstrate the distinct roles of the A′- and B-site spins on the magnetic propertiesand the origin of the spin-glass-like state in double distorted perovskites Ln(Cu$_{3−x}$Mn$_x$)Mn$_4$O$_{12}$ family of compounds
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Dates et versions

hal-03874650 , version 1 (21-12-2023)

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Qiang Zhang, Yohann Bréard, Vincent Hardy. Spin-glass-like state and reversible room-temperature magnetocaloric effect in double distorted perovskites Nd(Cu$_{3–x}$Mn$_x$ )Mn$_4$O$_{12}$. Inorganic Chemistry, 2022, 61 (15), pp.5792-5799. ⟨10.1021/acs.inorgchem.1c03895⟩. ⟨hal-03874650⟩
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