The angular magnetothermoelectric power of a charge density wave system

Krstovska, D; Choi, E S; Steven, E; Brooks, J S

doi:10.1088/0953-8984/24/26/265502

The angular magnetothermoelectric power of a charge density wave system

Journal

Journal of physics. Condensed matter : an Institute of Physics journal

Date Issued

2012-07-04

Author(s)

Krstovska, D

Choi, E S

Steven, E

Brooks, J S

DOI

10.1088/0953-8984/24/26/265502

Abstract

The angular dependence of the magnetothermopower of a charge transfer organic salt α-(ET)(2)KHg(SCN)(4) below (4 K) and above (9 K) the phase transition temperature, T(p) = 8 K, and under fields of 15 T and 25 T, below and above the 'kinkfield', has been studied. We find that for a longitudinal thermoelectric measurement both an interlayer thermopower (the Seebeck effect), S(zz), and a transverse thermopower (the Nernst effect), S(yz), exist in all three different B-T phases (the CDW (0), CDW (x) and metallic states) with large amplitude. Both thermoelectric effects display a resonant-like behavior without a sign reversal at the angles corresponding to angular magnetoresistance oscillation minima and maxima in this compound. The resonant behavior is most evident in the CDW(0) state, indicating a mechanism involving the Fermi surface nesting. Angular dependences reveal different behaviors of the thermopower and Nernst effect in the high magnetic field (CDW(x)) state.

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