Muhammad Naufal Farras, Rosaldi Pratama, Muhammad Naufal Ardian, Utami Widyaiswari, Rahma Sundaya Effendi, Muhammad Abdan Syakuur, Anita Eka Putri, Risdiana, Togar Saragi
₊High-Temperature Superconductor Cuprates (HTSC) are materials that exhibit superconductivity at higher temperatures compared to conventional superconductors. The effect of impurities in HTSC in the overdoped region is very important to study because there are interesting phenomena, such as the spin-glass state. In this study, we have synthesized Eu₂₋(x+y)Ceₓ-yCu₁₋yFeyO₄α₋δ (ECCFO) materials with x = 0.18, 0.19, 0.20, 0.21 and y = 0, 0.03 using the solid-state reaction method to study the effect of Fe impurities on the crystal structure and magnetic properties in the overdoped region. The crystal structure was characterized using XRD measurements, and the magnetic properties were characterized using SQUID measurements at temperatures of 2 K to 30 K with a magnetic field of H = 5 Oe. The XRD measurement results show that all samples have a tetragonal Tc structure, which corresponds to the ECCO crystal structure. The values of the lattice parameter c, unit cell volume, and CuO bond length increase with increasing y. From the SQUID measurements, for y = 0 with x = 0.19, 0.20, shows superconducting properties with Tc onset around 11 K. For variation y = 0.03 with x = 0.18, 0.20, 0.21, antiferromagnetic-like properties were observed, while the sample with x = 0.19 shows paramagnetic properties. These results indicate that Fe as a magnetic impurity affects spin arrangement in the conduction layers, as evidenced by an increase in the Curie constant and the effective magnetic moment. © 2025 Trans Tech Publications Ltd. All Rights Reserved.
Department of Physics, Padjadjaran University, Jl. Raya Bandung-Sumedang Km. 21, Jatinangor, Sumedang, 45363, Indonesia; Department of Chemistry, Padjadjaran University, Jl. Raya Bandung-Sumedang Km. 21 Jatinangor, Sumedang, 45363, Indonesia; Physics study program, Universitas Pendidikan Indonesia, Bandung, 40154, Indonesia; Meson Science Laboratory, RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan; Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok, 16424, Indonesia
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