Low Temperature Physics: 37, 755 (2011); https://doi.org/10.1063/1.3670035 (7 pages)
Физика Низких Температур: Том 37, Выпуск 9-10 (Сентябрь 2011), c. 950-958    ( к оглавлению , назад )

Angular dependent magnetothermopower of α-(ET)2KHg(SCN)4

D. Krstovska*, E. Steven, E.S. Choi, and J.S. Brooks

National High Magnetic Field Laboratory, Florida State University 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
E-mail: brooks@magnet.fsu.edu

Received April 5, 2011


The magnetic field and angular dependences of the thermopower and Nernst effect of the quasi-twodimensional (q2D) organic conductor α-(ET)2KHg(SCN)4 are experimentally measured at temperatures below (4 K) and above (9 K) the transition temperature to fields of 31 T. In addition, a theoretical model which involves a magnetic breakdown effect between the q1D and q2D bands is proposed in order to simulate the data. Analysis of the background components of the thermopower and Nernst effect imply that at low temperatures, in the CDW state, the properties of α-(ET)2KHg(SCN)4 are determined mostly by the orbits on the new open Fermi sheets. Quantum oscillations observed in the both thermoelectric effects, at fields above 8 T, originate only from the α orbit.

PACS: 71.45.Lr Charge-density-wave systems;
PACS: 72.15.Nj Collective modes;
PACS: 72.15.Jf Thermoelectric and thermomagnetic effects.

Key words: charge density wave, multiband system, α-(ET)2KHg(SCN)4, magnetic breakdown, quantum oscillations.