Magnetic field-temperature phase diagram study of the organic superconductor kappa-(ET)2 copper(nitrogen-carbon-sulfur)2 in the parallel orientation

The mechanism of superconductivity has been the subject of intense investigation since the discovery of the high-temperature superconductors. Organic superconductors are good candidates to study the superconductivity, because they have much lower transition temperatures as compared to high-temperature superconductors, and hence they have much lower upper critical fields. This allows one to study temperature-magnetic field phase diagram of the organic superconductors completely. This compelling advantage enabled us to study the temperature-magnetic field phase diagram of the organic superconductor kappa-(ET) 2Cu(NCS)2 when the applied magnetic field is in parallel orientation with respect to its conducting planes.;A tunnel diode oscillator technique is developed for our experimental setup and used to investigate properties of the organic superconductors at low temperatures and high magnetic fields.;It is claimed that the Fulde-Ferrell-Larkin-Ovchinikov (FFLO) state can be seen in the two dimensional clean superconductors under right conditions, such as low temperatures and high magnetic fields applied parallel to the conducting planes. This intriguing state has been investigated specifically for the organic superconductor kappa-(ET)2Cu( NCS)2. The magnetic field-temperature phase diagram is constructed for this sample. The phase diagram showed an upturn around 0.3 Tc and upper critical magnetic fields exceeds the Pauli Paramagnetic Limit, and the critical temperature of 9 K is measured.