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Hortensius, H.L. (author), Driessen, E.F.C. (author), Klapwijk, T.M. (author), Berggren, K.K. (author), Clem, J.R. (author)We demonstrate experimentally that the critical current in superconducting NbTiN wires is dependent on their geometrical shape, due to current-crowding effects. Geometric patterns such as 90? corners and sudden expansions of wire width are shown to result in the reduction of critical currents. The results are relevant for single-photon detectors...journal article 2012