Paramagnon drag in high thermoelectric figure of merit Li-doped MnTe

Zheng, Y.; Lu, T.; Polash, Md M.  H.; Rasoulianboroujeni, M.; Liu, N.; Manley, Michael E.; Deng, Y.; Sun, P. J.; Chen, X. L.; Hermann, Raphael P.; Vashaee, D.; Heremans, J. P.; Zhao, H.

doi:10.1126/sciadv.aat9461

Title: Paramagnon drag in high thermoelectric figure of merit Li-doped MnTe

Journal Article · Fri Sep 13 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aat9461· OSTI ID:1564212

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The Ohio State Univ., Columbus, OH (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
North Carolina State Univ., Raleigh, NC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Local thermal magnetization fluctuations in Li-doped MnTe are found to increase its thermopower α strongly at temperatures up to 900 K. Below the Néel temperature (T_N~ 307 K), MnTe is antiferromagnetic, and magnon drag contributes α_mdto the thermopower, which scales as ~T³. Magnon drag persists into the paramagnetic state up to >3 ×T_N because of long-lived, short-range antiferromagnet-like fluctuations (paramagnons) shown by neutron spectroscopy to exist in the paramagnetic state. The paramagnon lifetime is longer than the charge carrier–magnon interaction time; its spin-spin spatial correlation length is larger than the free-carrier effective Bohr radius and de Broglie wavelength. Thus, to itinerant carriers, paramagnons look like magnons and give a paramagnon-drag thermopower. This contribution results in an optimally doped material having a thermoelectric figure of merit ZT> 1 at T> ~900 K, the first material with a technologically meaningful thermoelectric energy conversion efficiency from a spin-caloritronic effect.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1564212

Journal Information:: Science Advances, Vol. 5, Issue 9; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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Cited By (1)

Magnon-drag thermopower in antiferromagnets versus ferromagnets Polash, Md. Mobarak Hossain; Mohaddes, Farzad; Rasoulianboroujeni, Morteza Journal of Materials Chemistry C, Vol. 8, Issue 12 https://doi.org/10.1039/c9tc06330g	journal	January 2020