Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction

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dc.creatorSellier, H.
dc.creatorBaraduc, C.
dc.creatorLefloch, F.
dc.creatorCalemczuk, R.
dc.date2004-06-10
dc.date.accessioned2026-07-07T02:58:34Z
dc.date.available2026-07-07T02:58:34Z
dc.descriptionWe investigate the current-phase relation of S/F/S junctions near the crossover between the 0 and the pi ground states. We use Nb/CuNi/Nb junctions where this crossover is driven both by thickness and temperature. For a certain thickness a non-zero minimum of critical current is observed at the crossover temperature. We analyze this residual supercurrent by applying a high frequency excitation and observe the formation of half-integer Shapiro steps. We attribute these fractional steps to a doubling of the Josephson frequency due to a sin(2*phi) current-phase relation. This phase dependence is explained by the splitting of the energy levels in the ferromagnetic exchange field.
dc.description4 pages, 5 figures, accepted for publication in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0406236
dc.identifierhttp://arxiv.org/abs/cond-mat/0406236
dc.identifierPhys. Rev. Lett. 92, 257005 (2004)
dc.identifierdoi:10.1103/PhysRevLett.92.257005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24147
dc.subjectSuperconductivity
dc.subjectMesoscale and Nanoscale Physics
dc.titleHalf-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction
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