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Title: Spin-Glass-like State and Reversible Room-Temperature Magnetocaloric Effect in Double Distorted Perovskites Nd(Cu3–xMnx)Mn4O12

Journal Article · · Inorganic Chemistry
ORCiD logo [1];  [2];  [2]
  1. Centre National de la Recherche Scientifique (CNRS) (France); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Centre National de la Recherche Scientifique (CNRS) (France)

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 –ΔSM are 1.5 J/kg K at 300 K and 1.4 J/kg K at 280 K, respectively. Furthermore, the –ΔSM(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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1867767
Journal Information:
Inorganic Chemistry, Vol. 61, Issue 15; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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