National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
J Phys Condens Matter. 2012 Jul 4;24(26):265502. doi: 10.1088/0953-8984/24/26/265502. Epub 2012 Jun 12.
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.
在相变温度 T(p) = 8 K 以下和以上（9 K）以及在 15 T 和 25 T 以下和以上的“扭折场”下，研究了电荷转移有机盐 α-(ET)(2)KHg(SCN)(4)的磁热功率的各向异性。我们发现，对于纵向热电测量，存在层间热功率（塞贝克效应）S(zz)和横向热功率（奈耳效应）S(yz)，在所有三个不同的 B-T 相中（CDW(0)、CDW(x)和金属态）均具有大振幅。在这个化合物中，对应于角磁电阻振荡极小值和极大值的角度，两个热电效应都表现出类似共振的行为，没有符号反转。在 CDW(0)态中，共振行为最为明显，表明涉及费米面嵌套的机制。角依赖性揭示了在高磁场（CDW(x)）态中热功率和奈耳效应的不同行为。
