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

Abstract:

: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 (TN ~ 307 K), MnTe is antiferromagnetic, and magnon drag contributes αmd to the thermopower, which scales as ~T3. Magnon drag persists into the paramagnetic state up to >3 × TN 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.

journal_name

Sci Adv

journal_title

Science advances

authors

Zheng Y,Lu T,Polash MMH,Rasoulianboroujeni M,Liu N,Manley ME,Deng Y,Sun PJ,Chen XL,Hermann RP,Vashaee D,Heremans JP,Zhao H

doi

10.1126/sciadv.aat9461

subject

Has Abstract

pub_date

2019-09-13 00:00:00

pages

eaat9461

issue

9

issn

2375-2548

pii

aat9461

journal_volume

5

pub_type

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