Publications [#245827] of Albert M. Chang

Papers Published
  1. Hallen, HD; Seshadri, R; Chang, AM; Miller, RE; Pfeiffer, LN; West, KW; Murray, CA; Hess, HF, Direct spatial imaging of vortices in a superconducting wire network, Physical Review Letters, vol. 71 no. 18 (1993), pp. 3007-3010, APS [p3007] .

    We report direct observations of vortices in a square superconducting wire grid imaged using scanning Hall probe microscopy. Real space images of vortex configurations are obtained as a function of the flux per unit cell f by measuring the local magnetic field just above the sample. At f = 1/2 we observe domains of the checkerboard ground state. As f is reduced from 1/2 to 1/3 vacancies first penetrate the grain boundaries and then the checkerboard domains. Near f = 1/3 we observe domains of the 1/3 staircase ground state. Heating the sample close to Tc produces correlated vortex hopping.