Dr Moon-Sun Nam

Abstract:

We have developed a model for parameterizing the shape of the quasi-two-dimensional (Q2D) Fermi surface (FS) sections found in many organic molecular metals. Using this model, we show that it is possible to extract more detail about the Q2D pocket shape from angle-dependent magnetoresistance oscillations than in the traditional approximation which assumes an elliptical FS shape. We also consider the implications for cyclotron resonance experiments.

Abstract:

The magnetic behaviour and resistivity of single crystals of the layered organic superconductor, κ-(BEDT-TTF)2Cu(NCS)2, have been studied as a function of the orientation of the applied magnetic field. When the magnetic field lies in the quasi-two-dimensional planes of the material, there is strong evidence for a phase transition from the superconducting state into a Fulde-Ferrell-Larkin-Ovchinnikov state.