Phase Transitions of 2D Josephson Tunnel Junction Arrays
1987
We have studied square 2D arrays of Josephson tunnel junctions at different values of the normalized magnetic flux per cell f. At f=0 Kosterlitz-Thouless behaviour is observed in the linear as well as in the non-linear resistance. For low nonzero values of f the linear resistance shows thermally activated behaviour at low temperatures with f-dependent activation energy. At f=l/2 the phase transition is different from that at arbitrary or zero field
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