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Thermopower behaviour of incommensurate charge density wave systems — (NbSe4)10 3I and (TaSe4)2I

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
76
Issue
2
Identifiers
DOI: 10.1016/0038-1098(90)90544-l

Abstract

Abstract The temperature dependence of thermoelectric power has been measured in the quasi-one dimensional charge density-wave (CDW) systems (NbSe 4) 10 3 I and (TaSe 4) 2 I. In the (NbSe 4) 10 3 I system, the thermopower remains positive throughout the temperature range investigated (120–350 K) whereas for (TaSe 4) 2 I it changes sign from negative values above the Peierls transition temperature ( T p = 263 K to positive values below T p. Both these results are in agreement with Hall effect measurements. In addition we deduce from the temperature dependence of thermopower below T p that there exists larger electron-hole asymmetry (σ e/σ h) in (NbSe 4) 10 3 I as compared to (TaSe 4) 2 I. The unusual behaviour of thermopower below a temperature ( T m) in these and other incommensurate systems is attributed to CDW drag effects of Umklapp type.

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