Prof Arzhang Ardavan

Abstract:

We present a numerical simulation of angle dependent magnetoresistances oscillations(AMROs) in alpha-(BEDT-TTF)(2)KHg(SCN)(4). The nesting vector of the density wave and the magnetic breakdowngap in the low-temperature, low-magnetic-field state (LTLF) are constrained by simulations of quasi-one-dimensional (Q1D) AMRO. Quasi-two-dimensional (Q2D) AMRO simulations for the high-temperature, high-magnetic-field state (HTHF) allow the precise derivation of an ellipticity of the Q2D Fermi surface. Simulations of the field dependent AMRO demonstrate the gradual evolution of the FS from LTLF to HTHF states toward the kink transition at 23 T.

Abstract:

We present a numerical simulation of angle dependent magnetoresistances oscillations (AMROs) in α-(BEDT-TTF)2KHg(SCN)4. The nesting vector of the density wave and the magnetic breakdowngap in the low-temperature, low-magnetic-field state (LTLF) are constrained by simulations of quasi-one-dimensional (Q1D) AMRO. Quasi-two-dimensional (Q2D) AMRO simulations for the high-temperature, high-magnetic-field state (HTHF) allow the precise derivation of an ellipticity of the Q2D Fermi surface. Simulations of the field dependent AMRO demonstrate the gradual evolution of the FS from LTLF to HTHF states toward the kink transition at 23 T.

Abstract:

Magnetic measurements show that the quasi-two-dimensional superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) enters a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state below similar to 5.5 K in exactly in-plane magnetic fields similar to 19 - 24 T.

Abstract:

The quasi-two-dimensional superconductor was studied via magnetic measurements. It was observed that the sample entered a Fulde-Ferrell-Larkin-Ovchinnikov state below 5.5 K in an exact in-plane magnetic field. The evidence of the transition of the sample was further studied.

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.