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arXiv 2107.06016cond-mat.str-elcond-mat.mtrl-sci
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低自旋d $^5$钙钛矿中平凡和非平凡电子相位以及共线和非共线磁相位的探索

Exploration of trivial and non-trivial electronic phases and of collinear and non-collinear magnetic phases in low-spin d$^5$ perovskites

Amit Chauhan, B. R. K. Nanda

摘要:

由于原位库仑排斥($U$)和自旋轨道耦合(SOC)之间的竞争,$4d$和$5d$过渡金属氧化物已经成为新兴量子材料家族的重要成员。特别地,在八面体环境中,具有$d^5$电子组态的系统被发现能够具有不变的半金属态,并且微扰可以导致不同的磁相。在这项工作中,通过制定一个多带哈伯德模型和执行SOC可调DFT+ $U$计算的原型SrIrO $_3$和扩展的分析,以其他同构和等价的化合物,我们提出了八种可能的电子和磁性配置的$U$-SOC相图中,可以观察到在家庭的低自旋$d^5$钙钛矿。它们包括受保护的狄拉克半金属态、金属和绝缘体态、共线和非共线自旋有序。后者解释通过连接跳跃相互作用的旋转和倾斜的八面体中观察到的GdFeO $_3$。几个软相界的存在使得$d^5$钙钛矿家族成为研究在外部刺激下的电子和磁性相变的理想平台。

英文摘要:

The $4d$ and $5d$ transition metal oxides have become important members of the emerging quantum materials family due to competition between onsite Coulomb repulsion ($U$) and spin-orbit coupling (SOC). Specifically, the systems with $d^5$ electronic configuration in an octahedral environment are found to be capable of posessing invariant semimetallic state and perturbations can lead to diverse magnetic phases. In this work, by formulating a multi-band Hubbard model and performing SOC tunable DFT+$U$ calculations on a prototype SrIrO$_3$ and extending the analysis to other iso-structural and isovalent compounds, we present eight possible electronic and magnetic configurations in the $U$-SOC phase diagram that can be observed in the family of low-spin $d^5$ perovskites. They include the protected Dirac semimetal state, metal and insulator regimes, collinear and noncollinear spin ordering. The latter is explained through connecting hopping interactions to the rotation and tilting of the octahedra as observed in GdFeO$_3$. Presence of several soft phase boundaries makes the family of $d^5$ perovskites an ideal platform to study electronic and magnetic phase transitions under external stimuli.

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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