Electronic inhomogeneity in n- and p-type PbTe detected by 125Te NMR

E. M. Levin, J. P. Heremans, Mercouri G Kanatzidis, K. Schmidt-Rohr

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

125Te nuclear magnetic resonance spectra and spin-lattice relaxation of n- and p-type PbTe, self-doping narrow band-gap semiconductors, have been studied and compared to those of p-type GeTe. Spin-lattice relaxation in GeTe can be fit by one component, while that in both PbTe samples must be fit by at least two components, showing electronically homogeneous and inhomogeneous materials, respectively. For PbTe-based materials, the spin-lattice relaxation rate 1/T1 increases linearly with carrier concentration. The data for GeTe fall on the same line and allow us to extend this plot to higher concentrations. Long and short T1 components in both PbTe samples reflect "low," ∼1017 cm-3, and "high," ∼1018 cm-3, carrier concentration components. Carrier concentrations in both n- and p-type PbTe samples obtained from the Hall and Seebeck effects generally match the "high" carrier concentration component, and to some extent, ignore the "low" one. This demonstrates that the Hall and Seebeck effects may have a limited ability for the determination of carrier concentration in complex thermoelectric PbTe-based and other multicomponent materials.

Original languageEnglish
Article number115211
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number11
DOIs
Publication statusPublished - Sep 30 2013

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Carrier concentration
inhomogeneity
Nuclear magnetic resonance
Spin-lattice relaxation
nuclear magnetic resonance
Seebeck effect
electronics
spin-lattice relaxation
Hall effect
Doping (additives)
narrowband
plots

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Electronic inhomogeneity in n- and p-type PbTe detected by 125Te NMR. / Levin, E. M.; Heremans, J. P.; Kanatzidis, Mercouri G; Schmidt-Rohr, K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, No. 11, 115211, 30.09.2013.

Research output: Contribution to journalArticle

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AB - 125Te nuclear magnetic resonance spectra and spin-lattice relaxation of n- and p-type PbTe, self-doping narrow band-gap semiconductors, have been studied and compared to those of p-type GeTe. Spin-lattice relaxation in GeTe can be fit by one component, while that in both PbTe samples must be fit by at least two components, showing electronically homogeneous and inhomogeneous materials, respectively. For PbTe-based materials, the spin-lattice relaxation rate 1/T1 increases linearly with carrier concentration. The data for GeTe fall on the same line and allow us to extend this plot to higher concentrations. Long and short T1 components in both PbTe samples reflect "low," ∼1017 cm-3, and "high," ∼1018 cm-3, carrier concentration components. Carrier concentrations in both n- and p-type PbTe samples obtained from the Hall and Seebeck effects generally match the "high" carrier concentration component, and to some extent, ignore the "low" one. This demonstrates that the Hall and Seebeck effects may have a limited ability for the determination of carrier concentration in complex thermoelectric PbTe-based and other multicomponent materials.

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