The recent discovery of superconductivity with a transition temperature (T(c)) at 18 K in K(x)picene has extended the possibility of high-T(c) superconductors in organic materials. Previous experience based on similar hydrocarbons, like alkali-metal doped phenanthrene, suggested that even higher transition temperatures might be achieved in alkali-metals or alkali-earth-metals doped such polycyc...

The degree of charge transfer and the upper critical field of the organic superconductor ~MDT-TSF!(AuI2)x have been investigated ~MDT-TSF: methylenedithio-tetraselenafulvalene!. The x-ray oscillation photograph indicates that the anion lattice is incommensurate with the donor lattice, and the chemical composition is ~MDT-TSF!(AuI2)0.44 . The charge-transfer degree of this salt is 0.44. The elec...

Unconventional superconductivity typically occurs in materials in which a small change of a parameter such as bandwidth or doping leads to antiferromagnetic or Mott insulating phases. As such competing phases are approached, the properties of the superconductor often become increasingly exotic. For example, in organic superconductors and underdoped high-T(c) cuprate superconductors a fluctuatin...

We view MgB2 as electronically equivalent to (non-staggered) graphite (B − layer) that has undergone a zero gap semiconductor to a superconductor phase transition by a large c-axis (chemical) pressure due to Mg layers. Further, like the pπ bonded planar organic molecules, graphite is an old resonating valence bond (RVB) system. The RVB’s are the ‘preexisting cooper pairs’ in the ‘parental’ zero...

We report the magnetic-field amplitude and field-angle dependence of the superconducting onset temperature Tconset of the organic superconductor (TMTSF)2ClO4 in magnetic fields H accurately aligned to the conductive ab' plane. We revealed that the rapid increase of the onset fields at low temperatures occurs both for H || b' and H || a, irrespective of the carrier confinement. Moreover, in the ...

The specific heat of the layered organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2), where BEDT-TTF is bisethylenedithio-tetrathiafulvalene, has been studied in magnetic fields up to 28 T applied perpendicular and parallel to the superconducting layers. In parallel fields above 21 T, the superconducting transition becomes first order, which signals that the Pauli-limiting field is reached. In...

in the Layered Organic Superconductor BEDT-TTF 2Cu NCS 2 R. Lortz, Y. Wang, A. Demuer, P. H. M. Böttger, B. Bergk, G. Zwicknagl, Y. Nakazawa, and J. Wosnitza Department of Condensed Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland Grenoble High Magnetic Field Laboratory, CNRS, 38042 Grenoble Cedex 9, France Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossend...

We present transport measurements along the least conducting (c) direction of the organic superconductor (TMTSF)2ClO4 performed under an accurately aligned magnetic field in the low temperature regime. The experimental results reveal a two-dimensional confinement of the carriers in the (a,b) planes which is governed by the magnetic field component along the b ′ direction. This 2-D confinement i...