Inhomogeneous critical state in (ET)2Cu(NCS)2 and (ET)2Cu[N(CN)2]Br under field cycling

In this contribution we investigate the superconducting state of single crystals κ-(ET) 2 Cu(NCS) 2 and κ-(ET) 2 Cu[N(CN) 2 ]Br by using the organic radical as a surface ESR probe. From ESR linewidth and multi probe line splitting we extract the information on the topology of the flux line condensate. It is found that cycling of the external magnetic field parallel to the lateral surface of crystal creates new type of the critical state. New critical state, which cannot be explained by existing theories, supposes inhomogeneous distribution of superconducting parameters in the bulk of superconductor.