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Interplay of Magnetocrystalline Anisotropy and Kondo Interaction in Square-Net Lattice CeZn0.65Sb2
Haribrahma Singh1, Aarti Gautam1, Prabuddha Kant Mishra1
1Department of Chemistry, Indian Institute of Technology Delhi, New Delhi110016, India.
None:
CeZn0.65Sb2 single crystals were successfully grown using Sn flux and utilized for detailed investigation of magnetic and transport properties. Single-crystal X-ray diffraction analysis confirmed that the compound crystallizes in the tetragonal crystal system with space group P4/nmm. Our magnetic data reveal anisotropic ferromagnetic behavior characterized by multiple magnetic transitions and pronounced magnetic irreversibility in CeZn0.65Sb2. Isothermal magnetization measurements reveal strong magnetic anisotropy, identifying the c-axis as the hard axis of magnetization with field-induced metamagnetic transitions. In contrast, for H ⊥ c, the system exhibits soft ferromagnetic behavior, characterized by a saturation-like magnetization of 1.36 μB/Ce3+. Magnetic relaxation exhibits stretched-exponential behavior with β ≈ 0.30, consistent with spin-glass-like dynamics. Frequency-dependent anomalies in the AC susceptibility and spin-flip relaxation times of 10-10 to 10-11 s indicate a cluster spin-glass state, while the DC field dependence of the AC response reveals its coexistence with ferromagnetic ordering. Electrical transport measurements exhibit Kondo-like behavior, as evidenced by the small negative magnetoresistance of about 0.15%. The enhanced Sommerfeld coefficient γ ≈ 60 mJ mol-1 K-2 and reduced magnetic entropy near TC, obtained from specific heat measurements, further support the presence of Kondo correlations. Finally, a collective picture of Kondo lattices in CeTSb2 systems has been presented for their comparative and rational understanding.
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