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Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric
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Baral, Raju, Christensen, Jacob A., Hamilton, Parker K., Ye, Feng, Chesnel, Karine, Sparks, Taylor D., Ward, Rosa, Yan, Jiaqiang, McGuire, Michael A., Manley, Michael E., Staunton, Julie B., Hermann, Raphaël P. and Frandsen, Benjamin A. (2022) Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric. Matter, 5 (6). pp. 1853-1864. doi:10.1016/j.matt.2022.03.011 ISSN 2590-2385.
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Official URL: http://dx.doi.org/10.1016/j.matt.2022.03.011
Abstract
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 Néel temperature TN = 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.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Semiconductors , Magnetic fields, Thermoelectric materials, Antiferromagnetism | |||||||||||||||
Journal or Publication Title: | Matter | |||||||||||||||
Publisher: | Cell Press | |||||||||||||||
ISSN: | 2590-2385 | |||||||||||||||
Official Date: | 1 June 2022 | |||||||||||||||
Dates: |
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Volume: | 5 | |||||||||||||||
Number: | 6 | |||||||||||||||
Page Range: | pp. 1853-1864 | |||||||||||||||
DOI: | 10.1016/j.matt.2022.03.011 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 21 July 2022 | |||||||||||||||
Date of first compliant Open Access: | 25 April 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
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