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The magnetic field-induced superconductor-insulator-metal transition (SIMT)in partially deuterated $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Br, which is juston the Mott boundary, has been observed using the infrared magneto-opticalimaging spectroscopy. The infrared reflectivity image on the sample surfacerevealed that the metallic (or superconducting) and insulating phases coexistand they have different magnetic field dependences. One of the magnetic fielddependence is SIMT that appeared on part of the sample surface. The SIMT wasconcluded to originate from the balance of the inhomogenity in the sampleitself and the disorder of the ethylene end groups resulting from fast cooling.Comment: 5 pages, 5 figures, to appear in Phys. Rev.

Magnetic-field-induced superconductor-insulator-metal transition in an organic conductor: An infrared magneto-optical imaging spectroscopic study