Abstract
The stable induction of symmetry breaking through structural design is fundamentally crucial to explore unprecedented physical properties of strongly correlated oxides. However, it is challenging to achieve structural modulation and symmetry alteration using simple methods. Herein, we investigated the A-site binary doping in LaMnO3 perovskite system to achieve controlled modulation and explored its magnetic properties. La0.67Ca0.22K0.10MnO3 with modulated structures underwent a second-order magnetic transition which was clearly exhibited by the competition between ferromagnetism (FM) and antiferromagnetism (AFM). The evident doping-content-sensitive ferrimagnetic charge order behavior was also associated observed. It was illustrated as two ferrimagnetic transitions (TC1= 299K and TC2= 286K) and an evident charge order peak (TCO= 237K) in the temperature-dependent magnetization curve. The chemical ordering induced by the A-site ternary doping is also reflected in the magnetocaloric measurements, showing a reduction in the maximum magnetic entropy change. The above results indicate that the arrangement of the A-site ternary elements in perovskite manganese oxides (La1-x-yCaxKyMnO3) exhibits more complex and diverse magnetic transitions, and significantly enhances the charge order behavior compared to binary element arrangements (such as La0.5Ca0.5MnO3 whose order behavior is dominated by Mn³⁺ and Mn⁴⁺ permutations on the B site).
Published Version
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