Unraveling the origin of conductivity change in Co-doped FeRh phase transition

IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Communications Materials Pub Date : 2024-11-11 DOI:10.1038/s43246-024-00694-y
Ji-Ho Park, Min Tae Park, Geon-Woo Baek, Shin-ichi Kimura, Myung-Hwa Jung, Kab-Jin Kim
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Abstract

Phase-changing materials have been a cornerstone of condensed matter physics for decades. A quintessential example is iron-rhodium (FeRh), which undergoes a first-order phase transition from antiferromagnetic to ferromagnetic states near room temperature. The pivotal aspect of this transition is a marked alteration in electrical conductivity. However, its underlying origin still remains elusive, largely due to the difficulties of directly probing fundamental transport during this phase transition. In this study, we investigate the fundamentals of FeRh’s electrical transport employing terahertz time-domain spectroscopy (THz-TDS). Leveraging the Drude model, we discerned the distinct contributions of extrinsic (momentum scattering time, τ) and intrinsic (charge density, n, and effective mass, m*) factors to electrical conductivity independently. Notably, our investigation unveiled a sharp alteration in n and m* during the phase transition, contrasting with the gradual monotonic decrease of τ with rising temperature. Consequently, our findings provide compelling evidence that the conductivity change in FeRh during the phase transition originates from a restructuring of its band structure. This work provides a crucial step towards a comprehensive understanding of the electrical transport changes occurring during the phase transition, offering valuable insights into the behaviour of phase changing materials. Phase-changing materials such as FeRh, undergoing a first-order phase transition from antiferromagnetic to ferromagnetic near room temperature, are attractive for various applications. Here, terahertz time-domain spectroscopy provides evidence that the conductivity change in FeRh during the phase transition originates from a restructuring of its band structure.

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揭示掺杂 Co 的 FeRh 相变中电导率变化的起源
几十年来,相变材料一直是凝聚态物理学的基石。铁-铑(FeRh)就是一个典型的例子,它在接近室温时经历了从反铁磁态到铁磁态的一阶相变。这种转变的关键在于导电性的明显改变。然而,其根本原因仍然难以捉摸,这主要是由于难以直接探测这一相变过程中的基本输运。在本研究中,我们利用太赫兹时域光谱(THz-TDS)研究了 FeRh 的基本电输运。利用 Drude 模型,我们发现了外在因素(动量散射时间,τ)和内在因素(电荷密度,n 和有效质量,m*)对电导率的不同贡献。值得注意的是,我们的研究揭示了在相变过程中 n 和 m* 的急剧变化,这与 τ 随温度升高而逐渐单调下降的现象形成了鲜明对比。因此,我们的研究结果提供了令人信服的证据,证明相变过程中 FeRh 的电导率变化源于其带状结构的重组。这项工作为全面了解相变过程中发生的电传输变化迈出了关键的一步,为相变材料的行为提供了宝贵的见解。像 FeRh 这样的相变材料在室温附近经历了从反铁磁到铁磁的一阶相变,对各种应用都具有吸引力。在这里,太赫兹时域光谱学提供了证据,证明相变过程中 FeRh 的电导率变化源于其带状结构的重组。
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来源期刊
Communications Materials
Communications Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
12.10
自引率
1.30%
发文量
85
审稿时长
17 weeks
期刊介绍: Communications Materials, a selective open access journal within Nature Portfolio, is dedicated to publishing top-tier research, reviews, and commentary across all facets of materials science. The journal showcases significant advancements in specialized research areas, encompassing both fundamental and applied studies. Serving as an open access option for materials sciences, Communications Materials applies less stringent criteria for impact and significance compared to Nature-branded journals, including Nature Communications.
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