Magnetic and transport properties of the mixed 3d-5d-4f double perovskite Sm2CoIrO6

被引:8
作者
Pradhan, Suman Kalyan [1 ]
Dalal, Biswajit [1 ]
Saha, Rafikul Ali [1 ]
Datta, Raktim [2 ]
Majumdar, Subham [2 ]
De, Subodh Kumar [1 ]
机构
[1] Indian Assoc Cultivat Sci, Sch Mat Sci, 2A & 2B Raja SC Mullick Rd, Kolkata 700032, India
[2] Indian Assoc Cultivat Sci, Sch Phys Sci, 2A & 2B Raja SC Mullick Rd, Kolkata 700032, India
关键词
double perovskite; ferrimagnetism; 3D Mott VRH; STATE; MAGNETORESISTANCE; TEMPERATURE;
D O I
10.1088/1361-648X/ac066a
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Iridium-based double perovskites having mixed 3d-5d-4f magnetic sub-lattices are expected to exhibit exotic magnetic phenomenon. In this paper, we report a study of structural, magnetic and transport properties of the mixed 3d-5d-4f double perovskite Sm2CoIrO6 (SMCO), which crystallizes in monoclinic structure with space group P2(1)/n and the crystal symmetry remains same throughout the measured temperature down to 15 K. High resolution synchrotron x-ray diffraction reveals an isostructural phase transition around 104 K. Magnetization measurements on polycrystalline samples indicate that SMCO orders ferrimagnetically at T (FiM) = 104 K; while, a second transition is observed below 10 K due to the rare-earth (Sm3+) ordering. The ferrimagnetic transition is well-understood by Neel's two-sublattice model, which is primarily ascribed to antiferromagnetic coupling between Co2+ and Ir4+ sub-lattices. Electronic transport measurement shows the insulting behaviour of SMCO, which follows Mott variable-range hopping conduction mechanism. However, dielectric measurements as a function of temperature rules out the presence of magneto dielectric coupling in this compound.
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页数:10
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