Multiple magnetic transitions and complex magnetic behaviour of the perovskite manganite NdMn7O12
Multiple magnetic transitions and complex magnetic behaviour of the perovskite manganite NdMn7O12
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钙钛矿亚锰矿 NdMn7O12 的多重磁转变和复杂磁行为
DOI：
10.1016/j.jssc.2022.122969
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Belik;A. A.; Liu;R.; Zhang;L.; Terada;N.; Tanaka;M.; Yamaura;K.
在约6 GPa的高压和约1570 K的高温下制备了A位有序四重钙钛矿NdMn7O12。通过同步加速器X射线粉末衍射精修其晶体结构，并在I2/mat空间群室温下结晶。通过差示扫描量热法在 664 K 处检测到一种结构相变。通过比热和直流磁测量，发现 NdMn7O12atTN1= 84 K、TN2= 12 K 和 TN3= 9 K 存在三个磁相变。交流磁测量揭示了其他与频率相关的特征：82 K 附近的异常（atHac = 5 Oe）、TN2 和约 70 K 之间的异常（最大值接近 17 K）以及 6 K 附近的异常。在 TN1 和 TN2 处的介电常数上发现了小扭结，并且在 20 至 35 K 之间观察到介电常数上更强的频率相关阶跃，并伴随着尖锐的介电损耗峰值；峰移遵循激活定律。热释电电流测量没有检测到任何固有的铁电极化。 NdMn7O12 的磁性行为比 RMn7O12 家族的其他成员（R 是稀土阳离子）更复杂。
An A-site-ordered quadruple perovskite NdMn7O12was prepared at high pressure of about 6 GPa and high temperature of about 1570 K. Its crystal structure was refined from synchrotron X-ray powder diffraction, and it crystallizes in space groupI2/mat room temperature. One structural phase transition was detected at 664 K by differential scanning calorimetry. Three magnetic phase transitions were found in NdMn7O12atTN1= 84 K,TN2= 12 K, andTN3= 9 K by specific heat and direct current magnetic measurements. Alternating current magnetic measurements revealed additional frequency-dependent features: anomalies near 82 K (atHac= 5 Oe), anomalies spanning betweenTN2and about 70 K with maxima near 17 K, and anomalies near 6 K. Small kinks were found on dielectric constant atTN1andTN2, and much stronger frequency-dependent steps on dielectric constant were observed between 20 and 35 K accompanied by sharp dielectric loss peaks; peak shifts followed the activation law. Pyroelectric current measurements did not detect any intrinsic ferroelectric polarization. Magnetic behaviour of NdMn7O12is more complex than that of other members of the RMn7O12family (R is a rare-earth cation).
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影响因子：
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