Superconducting fluctuations and the reduced dimensionality of the organic superconductor k-„BEDT-TTF...2Cu„NCS...2 as observed through measurements of the de Haas–van Alphen effect

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4

The Fermi surface topology of the organic superconductor λ(BETS)2GaCl4 has been determined using the Shubnikov-de Haas and magnetic breakdown effects and angle-dependent magnetoresistance oscillations. The former experiments were carried out in pulsed fields of up to 60 T, whereas the latter employed quasistatic fields of up to 30 T. All of these data show that the Fermi-surface topology of λ-(...

Uniaxial stress study of the transport properties of the quasi-two-dimensional organic superconductor (BEDT-TTF)2Cu(NCS)2

We report the effects of uniaxial stress applied along the least conducting direction (a-axis) of the organic superconductor ~:-(BEDT-TTF)2Cu(NCS)2. We find that the superconducting transition temperature decreases With stress (dTc/dpa = 2 K/kbar). Furthermore, we find an increase in the area of the closed orbits on the Fermi sbrface with stress. These observations are at variance with predicti...

Shubnikov-de Haas effect in the quantum vortex liquid state of the organic superconductor κ -(BEDT-TTF)2Cu(NCS)2

Anomalous Behavior of the Thermoelectric Power in the Vicinity of the Superconducting Transition in the Organic Superconductors κ-(BEDT-TTF)2Cu(NCS)2 and κ-(BEDT-TTF)2Cu[ N(CN)2] Br

Trie in-plane thermoelectric power (TEP of trie layered orgamc superconductors ~-(BEDT-TTF)2Cu(NCS)2 and ~-(BEDT-TTF)2Cu[N(CN)2]Br bas been studied in trie vicinity of trie superconducting transition under magnetic field. Below trie transition temperature, an anomalous non-monotonic behavior of trie TEP is found in trie ~-(BEDT-TTF)2Cu(NCS)2 sait: instead of a graduai monotonic decrease, trie T...

De Haas-van Alphen effect in the organic superconductor -(BEDT-TTF) <Subscript>2 </Subscript>I <Subscript>3 </Subscript>

In the two-dimensional organic superconductor K-(BEDT-TTF)2I 3 de Haas-van Alphen oscillations were observed at magnetic fields above 5 T and temperatures between 0.4 and 2 K. We found two dHvA frequencies at 3.846 kT and 0.570 kT, which correspond to the cross-sectional areas of the Fermi surface expected from a tight-binding calculation. From the temperature dependence of the oscillation ampl...