The effect of pressure and uniaxial stress on the electronic structure of α-(BEDT-TTF)_2KHg(SCN)4 and κ-(BEDT-TTF)_2Cu(NCS)_2
Abstract
We have performed extended Huckel tight-binding calculations to model the effects of pressure and uniaxial stress on the electronic band structure of the anisotropic organic metals α-(BEDT-TTF)_2KHg(SCN)4 (a) and κ-(BEDT-TTF)_2Cu(NCS)2 (b). The calculated changes in the Fermi surface topology are in excellent agreement with the experimental values determined from Shubnikov-de Haas measurements. In (a) the area of the closed orbits increases with pressure and decreases with uniaxial stress, while in (b) the closed orbits increase both with pressure and stress. We also report predictions of the effects of uniaxial stress in the perpendicular directions and discuss the behaviour of the effective mass and magnetic breakdown probability.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.C1209S