Abstract
We have measured the Hall coefficient RH and the electrical conductivity σ of a series of ultrathin (∼55 nm) Al:ZnO films. These films reveal mesoscopic characteristics in electrical transport properties, i.e., both RH and σ obey lnT law in a wide temperature range (from liquid-helium temperatures to ∼100 K for RH and from liquid-helium temperatures up to several tens K for σ). These observations not only disclose the fundamental physical properties of the ultrathin Al:ZnO films but also provide strong evidences for the validity of the current theories concerning the electron-electron interaction in granular metals.
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