富铁磁性 FeTe 的异常热电传输特性,Physica Status Solidi-Rapid Research Letters

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富铁磁性 FeTe 的异常热电传输特性
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-07-05 , DOI: 10.1002/pssr.202100231
Md Mobarak Hossain Polash _{1,

2} , Daryoosh Vashaee _{1,

2}

Affiliation

磁性和量子效应之间的相互作用激发了对碲化铁的一些热电研究，但对接近磁结构转变温度（≈70 K）的输运特性的异常特征知之甚少。对Fe _1.1进行了详细调查Te 通过表征磁、热容量、电流磁和热电传输特性来了解这些异常的电子、磁和结构起源。磁化率分别表明反铁磁域和顺磁域中的双共线条纹和短程排序。霍尔电导率和横向磁阻揭示了受自旋波动和磁振子影响的多载流子传输。评估声子阻力和磁子阻力的贡献，以了解反铁磁热电中宽峰的起源。≈50 K 处的峰值和磁子热容的微不足道的熵贡献支持声子阻力作为起源。热导率的场相关增强必须与场相关自旋声子耦合修改相关联。磁场引起的热电势降低可归因于磁振子或顺磁振子的抑制，如磁化率数据所证明的那样。超过 70 K，由于结构变化改变声子模式，热导率急剧下降。了解源自自旋的这些特性，而量子效应有助于设计高性能自旋驱动热电材料。

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Anomalous Thermoelectric Transport Properties of Fe-Rich Magnetic FeTe

The interplay between magnetism and quantum effects has motivated several thermoelectric studies on iron-telluride yet with little insight on the anomalous features in transport properties near magnetostructural transition temperature (≈70 K). A detailed investigation is carried out on Fe_1.1Te by characterizing magnetic, heat capacity, galvanomagnetic, and thermoelectric transport properties to understand the electronic, magnetic, and structural origin of those anomalies. The magnetic susceptibility indicates a bicollinear stripe and short-range ordering in the antiferromagnetic and paramagnetic domains, respectively. Hall conductivity and transverse magnetoresistance reveal a multicarrier transport impacted by spin fluctuations and magnons. Contributions from phonon-drag and magnon-drag are evaluated to understand the origin of the broad peak in antiferromagnetic thermopower. The peak at ≈50 K and the insignificant entropy contribution from the magnonic heat capacity support the phonon-drag as the origin. The field-dependent enhancement of thermal conductivity must be associated with field-dependent spin-phonon coupling modification. The field-induced thermopower reduction can be attributed to the suppression of magnons or paramagnons, as evidenced by the magnetic susceptibility data. Above 70 K, the thermal conductivity drops sharply due to the structural change modifying phonon modes. Understanding these properties originated from the spin, and quantum effects are instrumental for designing high-performance spin-driven thermoelectrics.

更新日期：2021-07-05

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