The Suppression of Superconductivity in Heavily Overdoped Regime of Eu_1.81Ce_0.19CuO_4+α-δ by Nonmagnetic Zn Impurities

Abstract:

The suppression of superconductivity (T_c) in electron-doped superconducting materials Eu_1.81Ce_0.19Cu_1-yZn_yO_4+α-δ (ECCZO) heavily overdoped regimes by nonmagnetic impurity Zn with concentration of y = 0, 0.01, 0.02, and 0.03 has been successfully investigated by using XRD and SQUID measurements. All samples were synthesized using the solid-state reaction method. The crystal structure obtained from XRD measurements has a tetragonal T° structure, which matches the crystal structure of electron-doped superconductors in general. The addition of Zn impurity shows no change in the crystal structure, but there is a decrease in the α-lattice and an increase in the c-lattice, unit cell volume, and Cu-O bond length. This causes the distance between the charge reservoir and the conduction layer to increase and affects the disappearance of T_c. Magnetic susceptibility measurements using SQUID were carried out under FC (Field Cooling) conditions with temperatures between 2 - 30 K with a field of 5 Oe. The sample with y = 0 has diamagnetic properties with a superconductivity value (T_c) of about 11 K. The addition of Zn impurities succeeded in suppressing superconductivity as indicated by the disappearance of T_c, so that the sample is in the ground state. The Curie constant and the effective magnetic moment decrease with increasing Zn concentration. This is probably due to the decrease in Cu²⁺ when the non-magnetic Zn²⁺ atoms were added, therefore the overall value of the µ_eff decreases when Zn²⁺ substitutes some Cu²⁺. This result is different from that described by Abrikosov-Gor’kov theory in the hole-doped high-T_c cuprates.

• Periodical: Key Engineering Materials (Volume 1015)
• Pages: 3-10
• DOI: https://doi.org/10.4028/p-sgDs1u
• Online since: June 2025
• Authors: Rosaldi Pratama*, Muhammad Naufal Farras, Muhammad Abdan Syakuur, Yati Maryati, Utami Widyaiswari, Anita Eka Putri, Togar Saragi, Atiek Rostika Noviyanti, Risdiana Risdiana
• Keywords: Electron-Doped, HTSC, Magnetic Susceptibility, Superconductivity, Zn Impurity

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