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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 md to the thermopower, which scales as ~ T 3 . 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.more » « less
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Potapkin, V. ; Dubrovinsky, L. ; Sergueev, I. ; Ekholm, M. ; Kantor, I. ; Bessas, D. ; Bykova, E. ; Prakapenka, V. ; Hermann, R. P. ; Rüffer, R. ; et al ( , Physical Review B)
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Möchel, A. ; Sergueev, I. ; Nguyen, N. ; Long, Gary J. ; Grandjean, Fernande ; Johnson, D. C. ; Hermann, R. P. ( , Physical Review B)
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Möchel, A. ; Sergueev, I. ; Wille, H.-C. ; Voigt, J. ; Prager, M. ; Stone, M. B. ; Sales, B. C. ; Guguchia, Z. ; Shengelaya, A. ; Keppens, V. ; et al ( , Physical Review B)