Dramatically enhanced Seebeck coefficient in GeMnTe2–NaBiTe2 alloys by tuning the Spin's thermodynamic entropy. Issue 33 (11th August 2021)

• Record Type: Journal Article
• Authors: Zhang, Yan; Xu, Liang; Liu, Guo-Qiang; Cai, Jianfeng; Yin, Yinong; Shi, Fanfan; Tan, Xiaojian; Jiang, Jun
• Is Part Of: Physical chemistry chemical physics. Volume 23:Issue 33(2021)
• Page Start: 17866
• Page End: 17872
• Publication Date: 2021-08-11
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d1cp02545g
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : When the exchange integral J in GeMnTe2 is reduced by enlarging the lattice constant, we show that the Seebeck coefficient is dramatically enhanced owing to the increase of the spin's thermodynamic entropy. Abstract : The emerging material GeMnTe2 provides a rare example to study the spin degree of freedom in thermoelectric transport, as it exhibits an anomalous Seebeck coefficient driven by the spin's thermodynamic entropy. This work presents an unconventional strategy to optimize the thermoelectric performance of GeMnTe2 by manipulating the spin degree of freedom. NaBiTe2 is alloyed into GeMnTe2 to disorder the spin orientation under finite temperature, and the obtained Seebeck coefficient is confirmed to be dramatically enhanced by more than 150%. The measurements of XRD and magnetic susceptibility indicate that the increased Seebeck coefficient is due to the increase of the spin's thermodynamic entropy. Finally, the maximum ZT of 1.06 at 820 K is obtained in Ge0.8 Na0.1 Bi0.1 MnTe2 . This work enriches the physical picture of spin degree of freedom in thermoelectric materials.