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Two-step superconducting-to-normal transitions in frustrated triangular Josephson-junction arrays

In-Cheol Baek - No affiliation found

2013/03/15 Full-length article DOI: 10.1016/j.physc.2013.01.005 Journal: Physica C: Superconductivity

Abstract:

AbstractCurrent–voltage characteristics measurements suggest that the superconducting-to-normal transition in triangular Josephson-junction arrays with the frustration index f = 1/4 and 1/3, which may have excitations of zero-energy domain walls, occurs in two steps, a vortex-disordering transition followed by a Berezinskii–Kosterlitz–Thouless-like phase-disordering transition at a higher temperature. The transport data also indicate that a similar two-step transition occurs in a weakly frustrated array as well. Experimental findings for a weakly frustrated array are inconsistent with existing theory.