Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric
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 Neel temperature $$T_N$$ = 307 K. In this work, 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.
- Authors:
-
[1]
- Brigham Young Univ., Provo, UT (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Warwick, Coventry (United Kingdom)
- Publication Date:
- Research Org.:
- Brigham Young Univ., Provo, UT (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Engineering and Physical Sciences Research Council; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1865547
- Alternate Identifier(s):
- OSTI ID: 1876317; OSTI ID: 1907275
- Grant/Contract Number:
- SC0021134; AC05-00OR22725; EP/M028941/1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Matter (Online)
- Additional Journal Information:
- Journal Name: Matter (Online); Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2590-2385
- Publisher:
- Cell Press/Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; thermoelectric; antiferromagnetic semiconductor; MnTe; paramagnon drag; magnetic correlations; pair distribution function; magnetic pair distribution function; neutron scattering
Citation Formats
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. Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric. United States: N. p., 2022.
Web. doi:10.1016/j.matt.2022.03.011.
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., & Frandsen, Benjamin A. Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric. United States. https://doi.org/10.1016/j.matt.2022.03.011
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. Mon .
"Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric". United States. https://doi.org/10.1016/j.matt.2022.03.011. https://www.osti.gov/servlets/purl/1865547.
@article{osti_1865547,
title = {Real-space visualization of short-range antiferromagnetic correlations in a magnetically enhanced thermoelectric},
author = {Baral, Raju and Christensen, Jacob A. and Hamilton, Parker K. and Ye, Feng and Chesnel, Karine and Sparks, Taylor D. and Ward, Rosa and Yan, Jiaqiang and McGuire, Michael A. and Manley, Michael E. and Staunton, Julie B. and Hermann, Raphaël P. and Frandsen, Benjamin A.},
abstractNote = {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. In this work, 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.},
doi = {10.1016/j.matt.2022.03.011},
journal = {Matter (Online)},
number = 6,
volume = 5,
place = {United States},
year = {Mon Apr 25 00:00:00 EDT 2022},
month = {Mon Apr 25 00:00:00 EDT 2022}
}
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