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We investigate the resistance enhancement state (RES) where themagnetoresistance of the $\nu = 2/3$ fractional quantum Hall state (FQHS) isincreased with dynamic nuclear spin polarization (DNP) induced by a largeelectric current. After inducing DNP, we measure the temperature dependence ofthe magnetoresistance by a small current over a short period of time. We findthat the FQHS makes a phase transition to an insulating state. By measuring theHall resistance in the insulating state, we find that the RES exhibits aquantized Hall resistance. We discuss the RES in association with the Andersonlocalization.

Phase Transition to Insulating State from Quantum Hall State by Current-Induced Nuclear Spin Polarization