Abstract
The current–voltage (I–V) characteristics and electrical resistivity of isolated potassium manganese oxide(K0.27MnO2·0.5H2O) nanowires prepared by a simple hydrothermal method were investigated over a wide temperaturerange from 300 to 4 K. With lowering temperature, a transition from linear to nonlinearI–V curves was observed around 50 K, and a clear zero bias anomaly (i.e.,Coulomb gap-like structure) appeared on the differential conductance(dI/dV) curves, possibly due to enhanced electron–electron interaction at low temperatures. Thetemperature dependence of resistivity, , follows the Efros–Shklovskii (ES) law, as expected in the presence of a Coulomb gap.Here we note that both the ES law and Coulomb blockade can in principle lead to areduced zero bias conductance at low temperatures; in this study we cannot exclude thepossibility of Coulomb-blockade transport in the measured nanowires, especiallyin the low-temperature range. It is still an open question how to pin down theorigin of the observed reduction to a Coulomb gap (ES law) or Coulomb blockade.
Published Version
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