Abstract We report the analysis of the magnetic response detected on the cuprate superconductor Nd1.85Ce0.15CuO4. In particular the magnetic behavior of the sample has been studied by means of DC magnetization measurements as a function of the temperature (T) and DC magnetic field (H). The superconducting critical temperature Tc has been obtained by analyzing the m(T) curve performed in Zero Field Cooling-Field Cooling conditions. Moreover, the m(T) curve shows the presence of a magnetic background for temperatures above Tc. By considering the superconducting m(H) hysteresis loop at different temperatures, it can be noted that the width of the curves appears narrow corresponding to a weak superconductivity. This is confirmed by the field dependence of the critical current densities Jc extracted from the superconducting hysteresis loops m(H) at different temperatures within the Bean critical state model. In fact, at the lowest measurement temperature, Jc is close to zero already at low magnetic fields. Nevertheless, by means of the temperature dependence of Jc, the sample shows a strong pinning behavior that can open perspectives for future improvement in the fabrication of this material.

中文翻译：

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Nd1.85Ce0.15CuO4铜酸盐超导体直流磁特性及钉扎分析

摘要 我们报告了在铜酸盐超导体 Nd1.85Ce0.15CuO4 上检测到的磁响应分析。特别是通过直流磁化测量作为温度 (T) 和直流磁场 (H) 的函数来研究样品的磁性行为。通过分析在零场冷却-场冷却条件下执行的 m(T) 曲线，获得了超导临界温度 Tc。此外，m(T) 曲线显示温度高于 Tc 时存在磁性背景。通过考虑不同温度下的超导 m(H) 磁滞回线，可以注意到曲线的宽度看起来很窄，对应于弱超导性。这通过从 Bean 临界状态模型内不同温度下的超导磁滞回线 m(H) 提取的临界电流密度 Jc 的场依赖性得到证实。事实上，在最低测量温度下，Jc 在低磁场下已经接近于零。尽管如此，通过 Jc 的温度依赖性，样品显示出强大的钉扎行为，可以为该材料制造的未来改进开辟前景。