arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2403.13239cond-mat.str-elcond-mat.mtrl-sci
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钙钛矿KOsO3中的奇异磁性

Exotic magnetism in perovskite KOsO3

Jie Chen, Hongze Li, Javier Gainza, Angel Munoz, Jose A. Alonso, Jue Liu, Yu-Sheng Chen, Alexei A. Belik, Kazunari Yamaura, Jiaming He, Xinyu Li, John B. Goodenough, J. -S. Zhou

AI总结:

本研究在高压高温下合成新型钙钛矿KOsO3,通过结构相变与多种物性测量揭示其从局域化到巡游电子行为的奇异磁有序相,为5d电子体系提供了关键实验证据。

摘要:

一种新型钙钛矿KOsO3已在高压高温条件下稳定合成。通过同步辐射X射线粉末衍射(SXRD)数据的精修显示,该材料在500 K时为立方相(Pm-3m),随后在320 K发生相变至四方相(P4/mmm),并在230 K进一步转变为菱方相(R-3m)。钙钛矿KOsO3中较大的轨道重叠积分和5d电子的扩展波函数,使得我们能够探索从Mott和Hund耦合主导的物理机制到多种相互作用处于同等地位的物理状态。我们通过中子粉末衍射发现了一种奇异的磁有序相,并结合磁性、输运性质、差示扫描量热法和比热等一系列测量手段对其物理性质进行了表征,这些结果为处于局域化到巡游电子行为转变临界点的体系提供了全面的信息。

英文摘要:

A new perovskite KOsO3 has been stabilized under high-pressure and high temperature conditions. It is cubic at 500 K (Pm-3m) and undergoes subsequent phase transitions to tetragonal at 320 K (P4/mmm) and rhombohedral (R-3m) at 230 K as shown from refining synchrotron X-ray powder diffraction (SXRD) data. The larger orbital overlap integral and the extended wavefunction of 5d electrons in the perovskite KOsO3 allow to explore physics from the regime where Mott and Hund's rule couplings dominate to the state where the multiple interactions are on equal footing. We demonstrate an exotic magnetic ordering phase found by neutron powder diffraction along with physical properties via a suite of measurements including magnetic and transport properties, differential scanning calorimetry, and specific heat, which provide comprehensive information for a system at the crossover from localized to itinerant electronic behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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