Physics – Condensed Matter – Superconductivity
Scientific paper
1998-10-19
Phys. Rev. B 58, 14 524 (1998)
Physics
Condensed Matter
Superconductivity
9 pages including 7 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.58.14524
We study the zero-temperature phase transitions of two-dimensional superconducting arrays with both the self- and the junction capacitances in the presence of external magnetic fields. We consider two kinds of excitations from the Mott insulating phase: charge-dipole excitations and single-charge excitations, and apply the second-order perturbation theory to find their energies. The resulting phase boundaries are found to depend strongly on the magnetic frustration, which measures the commensurate-incommensurate effects. Comparison of the obtained values with those in recent experiment suggests the possibility that the superconductor-insulator transition observed in experiment may not be of the Berezinskii-Kosterlitz-Thouless type. The system is also transformed to a classical three-dimensional XY model with the magnetic field in the time-direction; this allows the analogy to bulk superconductors, revealing the nature of the phase transitions.
Choi Mahn-Soo
Choi Min-Young
Jeon Gun Sang
Kim Beom Jun
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