We have constructed the ground-state configurations for a square-lattice Josephson network in a magnetic field H=pΦ₀/qa², for all p and q in the range 1{≤}p{≤}q/2 and 2{≤}q{≤}20, leading to a better understanding of the zero-temperature phase diagram. We then compute the field dependence of the ground-state energy, helicity modulus, and critical current.
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Straley et al. (1993) studied this question.
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