Generic Seebeck effect from spin entropy

被引:47
作者
Sun, Peijie [1 ,2 ,3 ]
Kumar, K. Ramesh [1 ]
Lyu, Meng [1 ,2 ]
Wang, Zhen [1 ,2 ]
Xiang, Junsen [1 ]
Zhang, Wenqing [4 ]
机构
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Songshan Lake Mat Lab, Dongguan 523808, Peoples R China
[4] Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
来源
INNOVATION | 2021年 / 2卷 / 02期
基金
国家重点研发计划; 美国国家科学基金会;
关键词
Seebeck effect; magnetocaloric effect; spin entropy; thermoelectric material; POWER-FACTOR ENHANCEMENT; ELECTRONIC-STRUCTURE; THERMOELECTRIC PROPERTIES; CHARGE-CARRIERS; THERMOPOWER; TEMPERATURE; HEAT;
D O I
10.1016/j.xinn.2021.100101
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
How magnetism affects the Seebeck effect is an important issue of wide concern in the thermoelectric community but remains elusive. Based on a thermodynamic analysis of spin degrees of freedom on varied d-electron-based ferromagnets and antiferromagnets, we demonstrate that in itinerant or partially itinerant magnetic compounds there exists a generic spin contribution to the Seebeck effect over an extended temperature range from slightly below to well above the magnetic transition temperature. This contribution is interpreted as resulting from transport spin entropy of (partially) delocalized conducting d electrons with strong thermal spin fluctuations, even semiquantitatively in a single-band case, in addition to the conventional diffusion part arising from their kinetic degrees of freedom. As a highly generic effect, the spin-dependent Seebeck effect might pave a feasible way toward efficient "magnetic thermoelectrics."
引用
收藏
页数:6
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