2014
DOI: 10.1007/s11664-014-3492-8
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The Low-Temperature Seebeck Coefficient in Insulators

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Cited by 9 publications
(12 citation statements)
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“…We argue that this arises as a consequence of the huge number of configurations available to a hopping electron. Our result is in qualitative agreement with those subset of theoretical proposals [7][8][9], which do not predict a vanishing fate for the Seebeck coefficient in a zero-temperature insulator. Fig.…”
supporting
confidence: 92%
See 1 more Smart Citation
“…We argue that this arises as a consequence of the huge number of configurations available to a hopping electron. Our result is in qualitative agreement with those subset of theoretical proposals [7][8][9], which do not predict a vanishing fate for the Seebeck coefficient in a zero-temperature insulator. Fig.…”
supporting
confidence: 92%
“…This happens when thermally-induced flow of phonons pull electrons along their way giving rise to a finite electric field. As recently argued [9], it cannot paly a major role here. A large phonon drag contribution suddenly setting in below 1 K is implausible, since the electron-phonon coupling is weak and lattice thermal conductivity rapidly decreasing.…”
mentioning
confidence: 73%
“…Experimentally, however, Seebeck effect measurements in insulators have indicated that the Seebeck potential approaches zero as carrier concentration diminishes [64]. Mahan has attributed this apparent contradiction to the fact that the Seebeck potential does not diminish but rather a space-charge effect in insulators screens off the Seebeck potential [65,66]. In any case, in the absence of any carriers, Na 0.875 CoO 2 :Sb Co is of no use for converting heat gradient to measurable electric energy.…”
Section: Resultsmentioning
confidence: 99%
“…in dielectrics and non-degenerate semiconductors Seebeck coefficient diverges at T  0. Makhan [28,29] has given an explanation of why in experiments for dielectrics and nondegenerate semiconductors instead of divergence the Seebeck coefficient vanishes in the low temperature limit. This is due to the "space-charge effects" [28,29].…”
Section: Resultsmentioning
confidence: 99%
“…Makhan [28,29] has given an explanation of why in experiments for dielectrics and nondegenerate semiconductors instead of divergence the Seebeck coefficient vanishes in the low temperature limit. This is due to the "space-charge effects" [28,29]. We also observe the Seebeck coefficient vanishing at T  0 for samples with an intermediate cooling rate (the results of measurements at T < 30 K are not presented because of the high electrical resistance of the samples in this temperature range), but with increasing temperature the effect of space charge on the measurement of thermopower decreases and at T > 30 K we again observe the asymptotically correct (not masked by space charge effects) behavior of thermopower at low temperatures (Fig.…”
Section: Resultsmentioning
confidence: 99%