In the present work, we report a correlation between crystal structure, magnetic, and electrical properties in an exotic magnetic compound, NdBaMnO having ∼92% ordering between Nd and Ba, investigated using temperature-dependent synchrotron x-ray diffraction (XRD), dc magnetization and transport measurements. Temperature-dependent XRD data reveals that the compound undergoes various complex crystallographic phase transitions from high-temperature ( > 320 K) 4/ phase to intermediate (320 K – 280 K) phase to a mixed ( and 2) phase (280 K – 220 K) and to low-temperature 2 phase ( < 220 K). It is found that these crystallographic phase compositions play a crucial role in controlling its magnetic and transport properties. Temperature-dependent dc magnetization data show a sharp drop at the onset of mixed phase ( + 2) at 280 K followed by a broad hump at ∼ 220 K where mixed phase to 2 transition occurs, thus indicating a correlation between the structural and magnetic properties. The dc magnetization in the mixed phase region is calculated by considering a superposition of the magnetic moments of and 2 phases weighted by the fraction of each phase, which exactly follows the experimental magnetization data. Temperature variation of resistivity data shows a jump at ∼260 K, a temperature corresponding to 50–50% phase composition of and 2 phases. The compound shows insulating behavior over a whole temperature range as confirmed from the resistivity data. Further, application of magnetic field causes a shift of magnetic and transport transition temperatures which may be due to the magnetic field induced structural transition in the system.

中文翻译：

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混合价 A 位有序亚锰矿 NdBaMn2O6 中交织的晶体结构、磁性和电荷传输特性

在目前的工作中，我们报告了一种奇异磁性化合物 NdBaMnO 的晶体结构、磁性和电学性质之间的相关性，NdBaMnO 的 Nd 和 Ba 之间的有序度约为 92%，并使用温度相关的同步加速器 X 射线衍射 (XRD)、dc 进行了研究磁化强度和输运测量。与温度相关的 XRD 数据表明，该化合物经历了各种复杂的晶体相变，从高温 (> 320 K) 4/ 相到中间 (320 K – 280 K) 相，再到混合 (和 2) 相 (280 K – 220 K) 和低温两相 (< 220 K)。研究发现，这些晶相组成在控制其磁性和输运性能方面发挥着至关重要的作用。与温度相关的直流磁化强度数据显示，在 280 K 时混合相 (+2) 开始时急剧下降，随后在 ∼ 220 K 处出现宽阔的驼峰，其中发生混合相到 2 的转变，从而表明结构和磁性之间的相关性。混合相区域的直流磁化强度是通过考虑两相磁矩的叠加（按各相分数加权）来计算的，这完全遵循实验磁化数据。电阻率数据的温度变化显示在 ~260 K 处出现跳跃，该温度对应于 50-50% 的相组成和 2 相。正如电阻率数据所证实的那样，该化合物在整个温度范围内都表现出绝缘行为。此外，磁场的施加导致磁性和传输转变温度的变化，这可能是由于磁场引起系统中的结构转变。