Z. X. Zhou, G. Cao, S. McCall, J. Crow, R. P. Guertin, C. Mielke, D. Rickel
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引用次数: 1
摘要
摘要钌酸稀土Pr3RuO7是一种Mott绝缘体，在tn1 = 36 K和tn2 = 55 K两种温度下显示出磁性有序。用抗磁性的La代替Pr，用抗磁性的Nb代替Ru，结果表明tn1与稀土元素间的有序性有关，而tn2与稀土元素间的有序性有关。这些结果与Sm3RuO7相似，但Pr3RuC7的有序温度比所有其他已知的Ln3MO7体系都大，并且在T < T N2时，场冷磁化率和零场冷磁化率之间的差异较小。等温磁化测量，包括脉冲场测量，显示出在T≪TN1时，在B≈4T处的迟滞场诱导跃变与Pr矩的自旋重定向有关。Pr3RuO7在2K < T < 17 K时的热容量和100K < T < 300 K时的电阻率可以进一步表征。
Magnetic interactions in (Pr, La)3RuO7 and Pr3(Ru, Nb)O7
Abstract The rare-earth ruthenate Pr3RuO7 is a Mott insulator displaying magnetic ordering at two temperatures T N1 = 36 K and T N2 = 55 K. By substituting diamagnetic La for Pr and diamagnetic Nb for Ru, T N1 is shown to be associated with ordering among the rare earths and T N2 among the Ru cations. These results are similar to those of Sm3RuO7, but the ordering temperatures for Pr3RuC7 are large compared with all other known Ln3MO7 systems and there is less divergence between field-cooled and zero-field-cooled magnetic susceptibility for T < T N2. Isothermal magnetization measurements, including pulsed-field measurements, show hysteretic-field-induced transitions at B ≈ 4T for T ≪ TN1 associated with a spin reorientation of the Pr moments. Further characterization of Pr3RuO7 is provided from measurements of the heat capacity for 2K < T < 17 K and electrical resistivity for 100K < T < 300 K.
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