The Improvement of Magnetic Order in Overdoped Regime by Magnetic Impurities in Eu_2-(x+y)Ce_x-yCu_1-yFe_yO_4+α-δ

Abstract:

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₋_yFe_yO₄₊_α₋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 T' 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 T_c onset around 11 K. For variation y = 0.03 with x = 0.18; 0.20; 0.21, antiferromagnetic-like properties were observed, while the samples 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.

• Periodical: Materials Science Forum (Volume 1152)
• Pages: 65-74
• DOI: https://doi.org/10.4028/p-MKBH2y
• Online since: June 2025
• Authors: Muhammad Naufal Farras*, Rosaldi Pratama, Muhammad Naufal Ardian, Utami Widyaiswari, Rahma Sundaya Effendi, Muhammad Abdan Syakuur, Anita Eka Putri, Risdiana Risdiana, Togar Saragi
• Keywords: Electron-Doped, High-T_c Superconductor Cuprates, Magnetic Impurities, Susceptibility

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