Semifluxon

Semifluxon

In superconductivity, a Semifluxon is a vortex of supercurrent carrying the magnetic flux equal to the half of the magnetic flux quantum. Semifluxons exist in the so-called 0-π long Josephson junctions at the boundary between 0 and π regions. For a shorter junction length (approx. Josephson penetration depth λJ) the vortex does not fit into the junction and the flux inside the junction is reduced.

For the first time semifluxons were observed using d-wave superconductors at so called tricrystal grain boundaries and later in YBa2Cu3O7–Nb ramp zigzags. In these systems the phase shift of π takes place inside the d-wave superconductorand not at the barrier. Due to the advent of controlled coupling by proper chosen ferromagnetic thicknesses,0–π JJs have also recently been realized in low-Tc SFS-like systems cite journal
author = M. L. Della Rocca, M. Aprili, T. Kontos, A. Gomez and P. Spathis
year = 2005
title = Ferromagnetic 0-π Junctions as Classical Spins
journal = Physical Review
volume = 94
pages = 197003
doi = 10.1103/PhysRevLett.94.197003] and underdamped SIFS-typecite journal
author = M. Weides, M. Kemmler, H. Kohlstedt, R. Waser, D. Koelle, R. Kleiner and E. Goldobin
year = 2006
title = 0-π Josephson Tunnel Junctions with Ferromagnetic Barrier
journal = Physical Review
volume = 97
pages = 247001
doi = 10.1103/PhysRevLett.97.247001] .

ee also

*Josephson junction
*Pi Josephson junction
*Fractional vortices

References

External links

*cite journal
author = J. H. Xu, J. H. Miller, Jr., and C. S. Ting
year = 1994
title = π-vortex state in a long 0-π Josephson junction
journal = Physical Review
volume = 51
pages = 11958
doi = 10.1103/PhysRevB.51.11958

*cite journal
author = E. Goldobin, D. Koelle, R. Kleiner
year = 2002
title = Semifluxons in long Josephson 0-π-junctions
journal = Physical Review
volume = 66
pages = 100508
doi = 10.1103/PhysRevB.66.100508

*cite journal
author = C. C. Tsuei and J. R. Kirtley
title = d-Wave pairing symmetry in cuprate superconductors --- fundamental implications and potential applications
journal = Physica C: Superconductivity and its Applications
year = 2002
volume = 367
pages = 1

*cite journal
author = H. Hilgenkamp, Ariando, H.-J. H. Smilde, D. H. A. Blank, G. Rijnders, H. Rogalla, J. R. Kirtley and C. C. Tsuei,
title = Ordering and manipulation of the magnetic moments in large-scale superconducting π-loop arrays
journal = Nature (London)
year = 2003
volume = 442
pages = 50


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