Charge carrier effective mass and concentration derived from combination of Seebeck coefficient and Te125 NMR measurements in complex tellurides

Levin, E. M.

doi:10.1103/PhysRevB.93.245202

Title: Charge carrier effective mass and concentration derived from combination of Seebeck coefficient and ${}^{125}{Te}$ NMR measurements in complex tellurides

Journal Article · Mon Jun 27 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.245202· OSTI ID:1278781

Levin, E. M. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

Thermoelectric materials utilize the Seebeck effect to convert heat to electrical energy. The Seebeck coefficient (thermopower), S, depends on the free (mobile) carrier concentration, n, and effective mass, m*, as S ~ m*/n^2/3. The carrier concentration in tellurides can be derived from ¹²⁵Te nuclear magnetic resonance (NMR) spin-lattice relaxation measurements. The NMR spin-lattice relaxation rate, 1/T₁, depends on both n and m* as 1/T₁~(m*)^3/2n (within classical Maxwell-Boltzmann statistics) or as 1/T1~(m*)²n^2/3 (within quantum Fermi-Dirac statistics), which challenges the correct determination of the carrier concentration in some materials by NMR. Here it is shown that the combination of the Seebeck coefficient and ¹²⁵Te NMR spin-lattice relaxation measurements in complex tellurides provides a unique opportunity to derive the carrier effective mass and then to calculate the carrier concentration. This approach was used to study Ag_xSb_xGe_50–2xTe₅₀, well-known GeTe-based high-efficiency tellurium-antimony-germanium-silver thermoelectric materials, where the replacement of Ge by [Ag+Sb] results in significant enhancement of the Seebeck coefficient. Thus, values of both m* and n derived using this combination show that the enhancement of thermopower can be attributed primarily to an increase of the carrier effective mass and partially to a decrease of the carrier concentration when the [Ag+Sb] content increases.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1278781

Alternate ID(s):: OSTI ID: 1259584

Report Number(s):: IS-J-9009; PRBMDO

Journal Information:: Physical Review B, Vol. 93, Issue 24; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Title: Charge carrier effective mass and concentration derived from combination of Seebeck coefficient and ${}^{125}{Te}$ NMR measurements in complex tellurides