Abstract
The preparation, complex magnetic properties and room-temperature magnetocaloric effect in Nd(Cu3-xMnx)Mn4O12 with cation distribution (Nd3+)A(Cu3-x2+xMnx3+)A′(Mn1+x3+Mn3-x4+)BO122- (x = 1 and 1.5) have been reported. Both compounds show a sharp paramagnetic-ferromagnetic (FM) transition at TC of 300 and 280 K, respectively. The substitution of Cu by Mn at the A′ site induces the emergence of a spin glass state below ≈63 K for x = 1 and ≈72 K for x = 1.5 compound. Another antiferromagnetic-like magnetic transition is also observed in both compounds at 23 and 28 K, respectively, which is discussed as the antiferromagnetic coupling between Nd3+ at the A′ site and (Mn3+/Mn4+) at the B site. These two compounds exhibit room-temperature magnetocaloric effect. For a small field of 2 T, the maximum magnetic entropy changes -?SM are 1.5 J/kg K at 300 K and 1.4 J/kg K at 280 K, respectively. Moreover, the -?SM(T) curves show an asymmetric distribution, resulting in high refrigerant capacity values for both compounds. We further demonstrate the distinct roles of the A′- and B-site spins on the magnetic properties and the origin of the spin-glass-like state in double distorted perovskites Ln(Cu3-xMnx)Mn4O12 family of compounds.
| Original language | English |
|---|---|
| Pages (from-to) | 5792-5799 |
| Number of pages | 8 |
| Journal | Inorganic Chemistry |
| Volume | 61 |
| Issue number | 15 |
| DOIs | |
| State | Published - Apr 18 2022 |
Funding
This work has been primary supported by the European project “SOPRANO” under Marie Curie actions (Grant. No. PITN-GA-2008-214040) and the CNRS project “Réfrigération Magnétique” within the frame of the “Programme Interdisciplinaire Energie”. Q.Z. is supported by the Scientific User Facilities Division, Basic Energy Sciences, US DOE, at the late stage of this work.