M. Inada et al., First order vortex phase transition in the organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2), J L TEMP PH, 117(5-6), 1999, pp. 1423-1427
The local magnetic induction is measured in, the quasi-two dimensional orga
nic superconductor kappa-(BEDT-TTF)(2) Cu(NCS)(2) by using a micro Hall pro
be. The small step is observed on the temperature dependence of the local m
agnetic induction. This result implies the existence of the first-order pha
se transition of the vortex system in this organic superconductor as is alr
eady reported in, high-T-c oxide and other organic superconductors.