Clarification and exploration of novel transport phenomena caused by electron-electron interactions and spin degrees of freedom in molecular crystals

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We have measured the low-temperature nonlinear current-voltage characteristics, dielectric properties, and magnetoconductance of organic crystalline insulators caused by electron-electron Coulomb interaction and clarified their transport mechanism. The Mott and charge-order insulators exhibit the same transport properties at zero magnetic field, but their magnetoconductances differ due to different spin states of the carriers that contribute to the conductivity. We have also performed measurements using micro-fabricated electrodes and under microwave irradiation.