Magnetic-field-induced superconductivity in a two-dimensional organic conductor

Abstract

The application of a sufficiently strong magnetic field to a superconductor will, in general, destroy the superconducting state. Two mechanisms are responsible for this. The first is the Zeeman effect, which breaks apart the paired electrons if they are in a spin-singlet (but not a spin-triplet) state. The second is the so-called 'orbital' effect, whereby the vortices penetrate into the superconductors and the energy gain due to the formation of the paired electrons is lost. For the case of layered, two-dimensional superconductors, such as the high-Tc copper oxides, the orbital effect is reduced when the applied magnetic field is parallel to the conducting layers. Here we report resistance and magnetic-torque experiments on single crystals of the quasi-two-dimensional organic conductor lambda-(BETS)2FeCl4, where BETS is bis(ethylenedithio)tetraselenafulvalene. We find that for magnetic fields applied exactly parallel to the conducting layers of the crystals, superconductivity is induced for fields above 17 T at a temperature of 0.1 K. The resulting phase diagram indicates that the transition temperature increases with magnetic field, that is, the superconducting state is further stabilized with magnetic field.

A chirality-induced alpha phase and a novel molecular magnetic metal in the BEDT-TTF/tris(croconate)ferrate(iii) hybrid molecular system

“…6 Here we report the synthesis,{ X-ray structure,{ magnetic § and electrical properties" and band structure calculationsI of two new radical salts obtained with the recently prepared 7 [Fe(C 5 Furthermore, salt 1 constitutes, to our knowledge, the first case of a chirality-induced a phase as well as the first example of a pentamerized a phase.…”

Luminescence and Single‐Molecule‐Magnet Behaviour in Lanthanide Coordination Complexes Involving Benzothiazole‐Based Tetrathiafulvalene Ligands

“…[30,38] Such π-d and π-f systems have shown exciting transport properties such as antiferromagnetic-superconductor or magnetic-field-induced superconducting transitions. [39,40] To design the previously mentioned π-d and π-f systems, the TTF core must be decorated with an accepting group that can coordinate to the metal centre. The latter group can be active in the conducting properties.…”

Interplay Between Conducting and Magnetic Systems in the Antiferromagnetic Organic Superconductor κ-(BETS)2FeBr4

“…Moreover, at high magnetic fields where the AF insulating state is suppressed [3], the π-d interaction leads, via the Jaccarino-Peter compensation effect [4] to a fascinating field-induced superconducting (SC) state [5]. In the κ-(BETS) 2 FeX 4 (M = Cl, Br) salts, differing from the former by the structure of the BETS layers, the π-d interaction is weaker.…”