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arXiv 2205.00537cond-mat.mtrl-sci
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Sm₂NiMnO₆双钙钛矿中相互耦合的结构、电子与磁态的存在性

Existence of inter coupled structural, electronic and magnetic states in Sm$ _{2} $NiMnO$ _{6} $ double perovskite

S. Majumder, M. Tripathi, D. O. de Souza, A. Sagdeo, L. Olivi, M. N. Singh, S. Pal, R. J. Choudhary, D. M. Phase

AI总结:

本研究结合同步辐射X射线衍射、X射线吸收光谱和磁测量,揭示Sm₂NiMnO₆双钙钛矿在两个磁转变温度处结构、电子与磁态的相互耦合。

摘要:

不同相互作用之间的耦合,使得人们能够通过扰动任意自由度来调控多功能材料的物理性质。在此,我们旨在探究Sm₂NiMnO₆铁磁绝缘体双钙钛矿的结构、电子和磁可观测量之间的关联。我们采用的方法包括同步辐射X射线衍射的热演化、近边和扩展边硬X射线吸收光谱以及体相磁测量。SNMO中的磁有序经历两个转变:在T_C=159.6 K时,源于Ni-Mn亚晶格的铁磁排列;在T_d=34.1 K时,则源于极化的Sm顺磁矩相对于Ni-Mn网络的反平行排列。通过Ni/Mn-O、Ni-Mn键合特征以及Ni-O-Mn连接中超交换角随温度的变化可以观察到,SNMO的整体和局部晶体结构在T_C和T_d附近均发生同构转变。Ni、Mn 3d与O 2p电子态之间的杂化在磁转变附近也发生改变。另一方面,局部结构和磁化分析证实了Ni/Mn反位无序的迹象。晶体环境的变化通过改变金属-配体轨道重叠来支配磁响应。利用这些互补探测手段,我们发现SNMO中的结构、电子和磁态相互耦合,这使其成为具有技术应用潜力的平台。

英文摘要:

Coupling between different interactions allows to control physical aspects in multifunctional materials by perturbing any of the degrees of freedom. Here, we aim to probe the correlation among structural, electronic and magnetic observables of Sm$ _{2} $NiMnO$ _{6} $ ferromagnetic insulator double perovskite. Our employed methodology includes thermal evolution of synchrotron X-ray diffraction, near edge and extended edge hard X-ray absorption spectroscopy and bulk magnetometry. The magnetic ordering in SNMO adopts two transitions, at T$ _{C} $=159.6K due to ferromagnetic arrangement of Ni-Mn sublattice and at T$ _{d} $=34.1K because of anti-parallel alignment of polarized Sm paramagnetic moments with respect to Ni-Mn network. The global as well as local crystal structure of SNMO undergoes isostructural transitions across T$ _{C} $ and T$ _{d} $, observed by means of temperature dependent variation in Ni/Mn-O, Ni-Mn bonding characters and super exchange angle in Ni-O-Mn linkage. Hybridization between Ni, Mn 3\textit{d}, O 2\textit{p} electronic states is also modified in the vicinity of magnetic transition. On the other hand, the signature of Ni/Mn anti-site disorders are evidenced from local structure and magnetization analysis. The change in crystal environments governs the magnetic response by imposing alteration in metal - ligand orbital overlap. Utilizing these complimentary probes we have found that structural, electronic and magnetic states are inter-coupled in SNMO which makes it a potential platform for technological usage.

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