The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
M G Blamire - One of the best experts on this subject based on the ideXlab platform.
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evidence of Midgap State mediated transport in 45 symmetric 001 tiltyba2cu3o7 xbicrystal grain boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, M G BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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Midgap State based π junctions for digital applications
Applied Physics Letters, 2004Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M G BlamireAbstract:Midgap State-based YBa2Cu3O7−x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.
G Testa - One of the best experts on this subject based on the ideXlab platform.
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Evidence of Midgap-State-mediated transport in 45° symmetric [001] tiltYBa2Cu3O7−xbicrystal grain-boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, Emanuela Esposito, Mark G. BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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evidence of Midgap State mediated transport in 45 symmetric 001 tiltyba2cu3o7 xbicrystal grain boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, M G BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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Midgap State based π junctions for digital applications
Applied Physics Letters, 2004Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M G BlamireAbstract:Midgap State-based YBa2Cu3O7−x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.
A Monaco - One of the best experts on this subject based on the ideXlab platform.
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Evidence of Midgap-State-mediated transport in 45° symmetric [001] tiltYBa2Cu3O7−xbicrystal grain-boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, Emanuela Esposito, Mark G. BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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evidence of Midgap State mediated transport in 45 symmetric 001 tiltyba2cu3o7 xbicrystal grain boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, M G BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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Midgap State based π junctions for digital applications
Applied Physics Letters, 2004Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M G BlamireAbstract:Midgap State-based YBa2Cu3O7−x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.
E Sarnelli - One of the best experts on this subject based on the ideXlab platform.
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Evidence of Midgap-State-mediated transport in 45° symmetric [001] tiltYBa2Cu3O7−xbicrystal grain-boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, Emanuela Esposito, Mark G. BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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evidence of Midgap State mediated transport in 45 symmetric 001 tiltyba2cu3o7 xbicrystal grain boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, M G BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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Midgap State based π junctions for digital applications
Applied Physics Letters, 2004Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M G BlamireAbstract:Midgap State-based YBa2Cu3O7−x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.
Dae Joon Kang - One of the best experts on this subject based on the ideXlab platform.
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Evidence of Midgap-State-mediated transport in 45° symmetric [001] tiltYBa2Cu3O7−xbicrystal grain-boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, Emanuela Esposito, Mark G. BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
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evidence of Midgap State mediated transport in 45 symmetric 001 tiltyba2cu3o7 xbicrystal grain boundary junctions
Physical Review B, 2005Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M Ejrnaes, M G BlamireAbstract:We have investigated the effect of Midgap bound States on the Josephson properties of symmetric 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt bicrystal grain-boundary junctions (GBJ's) characterized by different junction widths. GBJ's, $1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ wide, show a monotonic temperature dependence of the Josephson current with a slight upwards curvature, the result of the competition between Midgap States and the opposite-sign continuous current. In some junctions, an increasing contribution of the Midgap-State-mediated current is observed at low temperatures, leading to an anomalous nonmonotonic temperature dependence of the critical current. This behavior is more evident for junctions smaller than $500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, where, in some cases, a 0- to $\ensuremath{\pi}$-junction transition is clearly observed. Experimental results agree qualitatively with theoretical models taking into account Midgap States in strongly nonuniform barrier interfaces.
-
Midgap State based π junctions for digital applications
Applied Physics Letters, 2004Co-Authors: G Testa, A Monaco, E Esposito, E Sarnelli, Dae Joon Kang, S H Mennema, E J Tarte, M G BlamireAbstract:Midgap State-based YBa2Cu3O7−x π-junctions have been fabricated by a focused ion-beam system using 45° symmetric [001] tilt SrTiO3 bicrystal substrates. Measurements, performed by inserting the junctions in a superconducting loop (as a double-phase sensitive test), show both an unconventional nonmonotonic temperature dependence of the Josephson current, with a local minimum at a crossover temperature T* and, around T*, a half flux quantum shift in the critical current versus magnetic field modulations, clear signs of a 0–π crossover with temperature. Such results demonstrate that conventional 45° symmetric grain boundary junctions may have potential for applications, from digital circuits to quantum computing.