X. Su

Dynamic disorders and its relaxation in organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

Abstract In this paper, we report direct evidence of dynamic structural disorders introduced by quenching a crystal of charge transfer salt κ-(BEDT-TTF)2Cu[N(CN)2]Br superconductor from high temperatures to 77 K. The sample quenched from different high temperatures relaxes to an equilibrium state with a single relaxation time constant. The magnitude of the relaxation amplitude is dependent on the quenching temperature up to 140 K, above which all relaxation curves overlap with each other. The results suggest strongly that the 140 K is associated with the onset temperature of the order-disorder transition of ethylene groups and the transition is responsible for the anomalous lattice expansion observed at this temperature.

Low temperature upper critical field studies in organic superconductor {beta}{double{underscore}prime}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}

Low temperature upper critical field studies have been carried out in a new organic superconductor {beta}{double{underscore}prime}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.Low temperature upper critical field studies have been carried out in a new organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.

Low Temperature Upper Critical Field Studies in Organic Superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3

Low temperature upper critical field studies have been carried out in a new organic superconductor {beta}{double{underscore}prime}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.Low temperature upper critical field studies have been carried out in a new organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.

Low temperature upper critical field studies in organic superconductor {beta}"-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.

Low temperature upper critical field studies have been carried out in a new organic superconductor {beta}{double{underscore}prime}-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.Low temperature upper critical field studies have been carried out in a new organic superconductor β″-(BEDT-TTF)2SF5CH2CF2SO3. For field parallel to the superconducting layers, the upper critical field determined from transport measurements exceeds the BCS Pauli limit at low temperatures. The angular dependence of the resistive transition shows that the upper critical field can be best described by a quasi-two-dimensional model with a cusp near the field parallel to the plane direction.

Interlayer magnetoresistance peak in {beta}"-(BEDT-TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}.

Transport measurements of interlayer magnetoresistance with the field parallel to the current direction have been performed on single crystals of organic superconductor β″-(BEDT–TTF)2SF5CH2CF2SO3. The magnetoresistance is found to display a pronounced peak as a function of magnetic field below the superconducting transition temperature, similar to those of κ-(BEDT–TTF)2X compounds. Analysis of the magnetoresistance peak in terms of a simple pair and quasiparticle tunneling model gives a physically negligible gap energy.

Interlayer magnetoresistance peak in {beta}{sup {double_prime}}-(BEDT{endash}TTF){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}

Transport measurements of interlayer magnetoresistance with the field parallel to the current direction have been performed on single crystals of organic superconductor β″-(BEDT–TTF)2SF5CH2CF2SO3. The magnetoresistance is found to display a pronounced peak as a function of magnetic field below the superconducting transition temperature, similar to those of κ-(BEDT–TTF)2X compounds. Analysis of the magnetoresistance peak in terms of a simple pair and quasiparticle tunneling model gives a physically negligible gap energy.

Interlayer magnetoresistance peak in β″-(BEDT–TTF)2SF5CH2CF2SO3

Transport measurements of interlayer magnetoresistance with the field parallel to the current direction have been performed on single crystals of organic superconductor β″-(BEDT–TTF)2SF5CH2CF2SO3. The magnetoresistance is found to display a pronounced peak as a function of magnetic field below the superconducting transition temperature, similar to those of κ-(BEDT–TTF)2X compounds. Analysis of the magnetoresistance peak in terms of a simple pair and quasiparticle tunneling model gives a physically negligible gap energy.