Magnetic Field-Induced Superconductor-Insulator-Metal Transition in an Organic Conductor: An Infrared Magneto-Optical Imaging Spectroscopy

Abstract

The magnetic field-induced superconductor-insulator-metal transition (SIMT) in partially deuterated $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br, which is just on the Mott boundary, has been observed using the infrared magneto-optical imaging spectroscopy. The infrared reflectivity image on the sample surface revealed that the metallic (or superconducting) and insulating phases coexist and they have different magnetic field dependences. One of the magnetic field dependence is SIMT that appeared on part of the sample surface. The SIMT was concluded to originate from the balance of the inhomogenity in the sample itself and the disorder of the ethylene end groups resulting from fast cooling.

5 pages, 5 figures, to appear in Phys. Rev. B

References in corpus (6)

• Unconventional critical behaviour in a quasi-two-dimensional organic conductor
• Transport criticality of the first-order Mott transition in a quasi-two-dimensional organic conductor, $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Effect of a magnetic field on Mott-Hubbard systems
• Imaging phase separation near the Mott boundary in the correlated organic superconductors $\kappa$-(BEDT-TTF)${}_2$X
• Magnetic-Field-Induced Mott Transition in a Quasi-Two-Dimensional Organic Conductor
• The origin of the phase separation in partially deuterated $\kappa$-(ET)${}_2$Cu[N(CN)${}_2$]Br studied by infrared magneto-optical imaging spectroscopy

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• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
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