Electrically insulating properties of the 5d double perovskite Sr2YOsO6
Electrically insulating properties of the 5d double perovskite Sr2YOsO6
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DOI：
10.1063/1.5001913
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发表时间：
2017-09
影响因子：
3.2
通讯作者：
Jinghua Li;Xia Wang;Hongyuan Wang;Y. Matsushita;Belik A. Alexei;T. Kolodiazhnyi;Gang Xu;Youguo Shi;Yanfeng Guo;K. Yamaura;Ying Chen
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作者：
Jinghua Li;Xia Wang;Hongyuan Wang;Y. Matsushita;Belik A. Alexei;T. Kolodiazhnyi;Gang Xu;Youguo Shi;Yanfeng Guo;K. Yamaura;Ying Chen
采用同步x射线衍射对高压合成的双钙钛矿Sr2YOsO6进行了研究，并测量了其磁化率、比热容、复阻抗和复介电常数。它结晶成单斜双钙钛矿结构（P21/n）， Y和Os原子完全有序。其反铁磁转变温度（~ 52 K）、居里-魏斯有效矩（3.48(5)μB/Os）和魏斯温度（- 350.1(7)K）接近于以往在6 GPa压力下合成的Sr2YOsO6。输运性质测量表明，活化能的下限为192(1)meV，并且无论磁序是否存在，电荷间隙都保持开放，这与理论计算预测的电子离域相矛盾。进一步的考虑，包括对自旋轨道耦合和5d的U的作用的理论和实验研究。
A high-pressure-synthesized double perovskite Sr2YOsO6 was investigated by synchrotron X-ray diffraction and measurements of its magnetic susceptibility, specific heat capacity, complex impedance, and complex dielectric constant. It crystallized into a monoclinic double perovskite structure (P21/n) with complete ordering of the Y and Os atoms. Its magnetic behaviors, including the antiferromagnetic transition temperature (∼52 K), Curie-Weiss effective moment [3.48(5) μB/Os], and Weiss temperature [−350.1(7) K], were close to the respective values of Sr2YOsO6 previously synthesized without an applied pressure of 6 GPa. Transport property measurements revealed that the lower limit of the activation energy was 192(1) meV and the charge gap remained open regardless of the presence of magnetic order, conflicting with the electron delocalization predicted by theoretical calculations. Further consideration, including theoretical and experimental investigations of the roles of spin–orbit coupling and U of the 5d ...