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Volumn 80, Issue 23, 2009, Pages

Resonant level formed by tin in Bi2 Te3 and the enhancement of room-temperature thermoelectric power

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EID: 77954750738     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.80.233201     Document Type: Article
Times cited : (214)

References (31)
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    • note
    • We could analyze the SdH results two ways: either the two oscillation frequencies arise from two different sets of degenerate sections of the Fermi surface, or the second frequency is a harmonic, and we just have one set of Fermi surface sections. Taking the second frequency as real, we calculate that it would correspond to cross-sections of the Fermi surface that are consistent with the LVB of Ref.. If we push this hypothesis further, we could use the Fermi level, total Hall carrier density, and SdH carrier density and effective mass of the UVB to deduce the density of carriers left in the LVB and their masses. The LVB hole density calculated under that hypothesis would be 2-5 times larger than that of the UVB, and the calculated LVB masses would approximately 1.5 - 3 m e, heavier than previously suggested. Furthermore, the LVB masses would appear to depend on tin concentration. This mathematical possibility is unphysical because it contradicts the calculations based on the four transport parameters (Fermi level, effective mass, scattering exponent, and mobility), and because the second frequency can be assigned to spin splitting, Ref..
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    • The Seebeck coefficient of Bi2 Te3 is anisotropic in general, but the partial Seebeck coefficients of each electron or hole pocket of the Fermi surface are scalars. The anisotropy arises from the fact that the total Seebeck coefficient is an average of the partial coefficients of each pocket weighted by the partial conductivities of those pockets, which are anisotropic. S11 is dominated by the partial hole Seebeck coefficient S in moderately p -type material.
    • The Seebeck coefficient of Bi 2 Te 3 is anisotropic in general, but the partial Seebeck coefficients of each electron or hole pocket of the Fermi surface are scalars. The anisotropy arises from the fact that the total Seebeck coefficient is an average of the partial coefficients of each pocket weighted by the partial conductivities of those pockets, which are anisotropic. S 11 is dominated by the partial hole Seebeck coefficient S in moderately p -type material.
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