期刊
MATTER
卷 5, 期 6, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.matt.2022.03.011
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-SC0021134]
- College of Physical and Mathematical Sciences at Brigham Young University
- UK Engineering and Physical Sciences Research Council [EP/M028941/1]
- US Department of Energy, Office of Science, Office of Basic Energy Science, Materials Science and Engineering Division
- US National Science Foundation CAREER program [DMR-1651668]
- U.S. Department of Energy (DOE) [DE-SC0021134] Funding Source: U.S. Department of Energy (DOE)
Short-range magnetic correlations can significantly enhance the thermopower of magnetic semiconductors. This study reveals the nature of such correlations in the antiferromagnetic semiconductor MnTe and provides a real-space view of nanometer-scale antiferromagnetic correlations. The findings inform future efforts to optimize thermoelectric performance using magnetic means.
Short-range magnetic correlations can significantly increase the thermopower of magnetic semiconductors, representing a noteworthy development in the decades-long effort to develop high-performance thermoelectric materials. Here, we reveal the nature of the thermopower-enhancing magnetic correlations in the antiferromagnetic semiconductor MnTe. Using magnetic pair distribution function analysis of neutron-scattering data, we obtain a detailed, real-space view of robust, nanometer-scale, antiferromagnetic correlations that persist into the paramagnetic phase above the Neel temperature T-N = 307 K. The magnetic correlation length in the paramagnetic state is significantly longer along the crystallographic c axis than within the ab plane, pointing to anisotropic magnetic interactions. Ab initio calculations of the spin-spin correlations using density functional theory in the disordered local moment approach reproduce this result with quantitative accuracy. These findings constitute the first real-space picture of short-range spin correlations in a magnetically enhanced thermoelectric and inform future efforts to optimize thermoelectric performance by magnetic means.
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