1994 年 63 巻 12 号 p. 4306-4309
We have measured transport properties of a two-dimensional array of small Josephson junctions with normal-state tunneling resistance RN=60, kΩ . The zero-bias resistance showed a so-called square-root-cusp-type temperature dependence in a limited temperature range and the current-voltage characteristics were nonlinear at lower temperatures. We interpret these features as a precursor of the charge Kosterlitz-Thouless-Berezinskii transition with a finite screening length.
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