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<p>Thin films of superconducting Nd<sub>1.85</sub>Ce<sub>0.15</sub>CuO<sub>4±δ</sub> were synthesized by a pulsed laser deposition method followed by ex situ annealing in an argon atmosphere. Structural, morphological and electrical characterizations were performed using X-ray diffraction, scanning electron microscopy and temperature-dependent resistivity measurements respectively. X-ray analysis reveals preferential orientation in (001) and (110) directions for the thin films. Resistivity measurements demonstrated a pronounced superconducting behavior in the argon annealed thin films. The critical superconducting properties, the upper critical field and critical current density, were investigated using magneto-transport and magnetization measurements. The anisotropic coefficient which is the ratio of the upper critical field parallel and perpendicular to that of <i>ab</i> plane has been assessed highlighting the significant anisotropy of the Nd<sub>1.85</sub>Ce<sub>0.15</sub>CuO<sub>4±δ</sub> superconductor. The analysis of the activation energy reveals the three-dimensional nature of the vortex lattice in this system.</p>

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Anisotropic Upper Critical Field in Nd1.85Ce0.15CuO4±δ Superconducting Thin Films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月26日

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  • N. Radhikesh Raveendran,
  • Vinita Kumawat,
  • E. P. Amaladass,
  • A. T. Sathyanarayana,
  • T. Geetha Kumary,
  • Awadhesh Mani

摘要

Thin films of superconducting Nd1.85Ce0.15CuO4±δ were synthesized by a pulsed laser deposition method followed by ex situ annealing in an argon atmosphere. Structural, morphological and electrical characterizations were performed using X-ray diffraction, scanning electron microscopy and temperature-dependent resistivity measurements respectively. X-ray analysis reveals preferential orientation in (001) and (110) directions for the thin films. Resistivity measurements demonstrated a pronounced superconducting behavior in the argon annealed thin films. The critical superconducting properties, the upper critical field and critical current density, were investigated using magneto-transport and magnetization measurements. The anisotropic coefficient which is the ratio of the upper critical field parallel and perpendicular to that of ab plane has been assessed highlighting the significant anisotropy of the Nd1.85Ce0.15CuO4±δ superconductor. The analysis of the activation energy reveals the three-dimensional nature of the vortex lattice in this system.