Synthesis and Magnetic Characterization of La_2-xSr_xCuO₄ Nanoparticles

Abstract:

Non-doped and strontium-doped lanthanum cuprates (La₂CuO₄ (LCO) and La_1.85Sr_0.15CuO₄ (LSCO15)) in nano-sized particles were synthesized by the chemically dissolved technique employing HNO₃ as the dissolving agent. The structural and magnetic properties were investigated by using an x-ray diffraction (XRD) apparatus and a superconducting quantum interference device (SQUID) magnetometer, respectively. The XRD patterns of LCO and LSCO15 show the formation of the single phase without impurities after the calcinations in air at 1100°C for 15 h and the post-annealing in oxygen at 800 °C for 24 h. The average crystallite sizes of LCO and LSCO15 samples were in a range of around 100 nm confirming nano-sized particles. The LCO and LSCO15 nanoparticles exhibit superconductivity at the superconducting (SC) transition temperature, T_c, of 23 K and 38 K, respectively. The magnetization curve measurements have revealed that both samples show the appearance of ferro- and dia-magnetic behavior at room temperature and the appearance of superconductivity at low temperatures. This result may indicate the coexistence of ferromagnetism and superconductivity below T_c in the nano-sized cuprates.

• Periodical: Key Engineering Materials (Volume 855)
• Pages: 58-63
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.855.58
• Online since: July 2020
• Authors: Malik Anjelh Baqiya, Putu Eka Dharma Putra, Resky Irfanita, Fitriana Fitriana, Darminto Darminto*, Takayuki Kawamata, Takashi Noji, Hidetaka Sato, Masatsune Kato
• Keywords: Chemically Dissolved Technique, Ferromagnetism, La_2-XSr_xCuO₄, Magnetic Properties, Superconductivity

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