Observation of conflicting Seebeck coefficient and Hall coefficient in Sb-doped MnBi4Te7 crystals

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-05-28 DOI:10.1063/5.0252064

Yinong Yin, Yan Zhang, Yutian Lang, Dan Liu, Jiazheng Hao, Lunhua He, Guoqiang Liu, Xiaojian Tan, Jun Jiang

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引用次数: 0

Abstract

In the past decades, great efforts have been devoted to designing and developing high-efficiency thermoelectric (TE) materials due to the increasing demands in the fields of power generation, cooling, and sensing. Given that the developments of TE materials based on charge and phonon engineering are facing a plateau, the manipulation of spin degree of freedom has been considered as an innovative strategy to further improve the TE performance, which has drawn growing attention in recent years. In this work, we studied the thermoelectric transport properties of Sb-doped MnBi4Te7 crystals, which contain the Bi2Te3 layers for charge transport and MnTe layers for spins. We observed abnormally low thermopower in the crystals with Sb doping ratios of 0.25 and 0.35, and the sign of thermopower is contradictory to the Hall coefficient. Further experiments evidenced magnetic field-enhanced thermopower and electrical resistivity over a wide temperature range, which support a spin-driven thermoelectric mechanism. An explanation based on the interplay between the spin and heat in entropy transport via charged carriers is proposed.

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掺sb MnBi4Te7晶体中塞贝克系数和霍尔系数冲突的观察

在过去的几十年里，由于发电、冷却和传感领域的需求不断增加，人们致力于设计和开发高效热电材料。鉴于基于电荷和声子工程的TE材料的发展面临瓶颈，操纵自旋自由度被认为是进一步提高TE性能的创新策略，近年来受到越来越多的关注。在这项工作中，我们研究了sb掺杂MnBi4Te7晶体的热电输运性质，该晶体包含Bi2Te3层用于电荷输运和MnTe层用于自旋。在Sb掺杂比为0.25和0.35的晶体中，我们观察到异常低的热功率，热功率的符号与霍尔系数相矛盾。进一步的实验证明了磁场增强的热功率和在宽温度范围内的电阻率，这支持自旋驱动的热电机制。本文提出了一种基于自旋与热的相互作用的解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.