Fractional vortices: Difference between revisions
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In [[superconductivity]], a '''Fractional vortex''' known also as '''splinter vortex''' is a vortex of [[supercurrent]] carrying |
In [[superconductivity]], a '''Fractional vortex''' known also as '''splinter vortex''' is a vortex of [[supercurrent]] carrying unquantized [[magnetic flux]], in oppose to conventional Josephson vortex and [[semifluxon]]s. Fractional vortices exist in the so-called 0-π [[long Josephson junction]]s arrays. Fractional vortices are [[soliton]]s which are able to move and preserve their shape much like conventional Josephson vortices in opposed to [[semifluxon]]s which are attached to the boundary between 0 and π regions. |
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For the first time fractional vortices were observed using d-wave superconductors at asymmetric 45° grain boundaries < |
For the first time fractional vortices were observed using d-wave superconductors at asymmetric 45° grain boundaries YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> . In these systems the phase shift of π takes place inside the d-wave superconductor |
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and not at the barrier. Due to the advent of controlled coupling by proper chosen ferromagnetic thicknesses, |
and not at the barrier. Due to the advent of controlled coupling by proper chosen ferromagnetic thicknesses, |
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0–π JJs have also recently been realized in low-T<sub>c</sub> SFS-like systems <ref name="DellaRocca0piSFS"> |
0–π JJs have also recently been realized in low-T<sub>c</sub> SFS-like systems <ref name="DellaRocca0piSFS"> |
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Revision as of 10:44, 10 September 2007
In superconductivity, a Fractional vortex known also as splinter vortex is a vortex of supercurrent carrying unquantized magnetic flux, in oppose to conventional Josephson vortex and semifluxons. Fractional vortices exist in the so-called 0-π long Josephson junctions arrays. Fractional vortices are solitons which are able to move and preserve their shape much like conventional Josephson vortices in opposed to semifluxons which are attached to the boundary between 0 and π regions.
For the first time fractional vortices were observed using d-wave superconductors at asymmetric 45° grain boundaries YBa2Cu3O7-δ . In these systems the phase shift of π takes place inside the d-wave superconductor and 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 [1] and underdamped SIFS-type [2].
See also
References
- Mints, R. G. and Papiashvili, Ilya and Kirtley, J. R. and Hilgenkamp, H. and Hammerl, G. and Mannhart, J. (2002). "Observation of Splintered Josephson Vortices at Grain Boundaries in YBa2Cu3O7-δ". Phys. Rev. Lett. 89: 067004. doi:10.1103/PhysRevLett.89.067004.
{{cite journal}}: Italic or bold markup not allowed in:|journal=(help)CS1 maint: multiple names: authors list (link)
- Mints, R. G. (1998). "Self-generated flux in Josephson junctions with alternating critical current density". Phys. Rev. B. 57: R3221. doi:10.1103/PhysRevB.57.R3221.
- C. C. Tsuei and J. R. Kirtley (2002). "d-Wave pairing symmetry in cuprate superconductors --- fundamental implications and potential applications". Physica C. 367: 1.
- H. Hilgenkamp, Ariando, H.-J. H. Smilde, D. H. A. Blank, G. Rijnders, H. Rogalla, J. R. Kirtley and C. C. Tsuei, (2003). "Ordering and manipulation of the magnetic moments in large-scale superconducting π-loop arrays". Nature (London). 442: 50.
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and
- ^
M. L. Della Rocca, M. Aprili, T. Kontos, A. Gomez and P. Spathis (2005). "Ferromagnetic 0-π Junctions as Classical Spins". Phys. Rev. Lett. 94: 197003. doi:10.1103/PhysRevLett.94.197003.
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M. Weides, M. Kemmler, H. Kohlstedt, R. Waser, D. Koelle, R. Kleiner and E. Goldobin (2006). "0-π Josephson Tunnel Junctions with Ferromagnetic Barrier". Phys. Rev. Lett. 97: 247001. doi:10.1103/PhysRevLett.97.247001.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
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