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• W2077896778 abstract "Theory predicts that $d$-wave superconductivity induces a significant second harmonic ${J}_{2}$ in the Josephson current, as a result of zero-energy Andreev states (ZES) formed at the junction interface. Consequently, anomalies such as half-integer Shapiro steps and signatures of period doubling of the dc Josephson current versus magnetic field should be observed. We performed experiments on junctions between untwinned $d$-wave ${text{YBa}}_{2}{text{Cu}}_{3}{text{O}}_{7ensuremath{-}ensuremath{delta}}$ and Nb and found no trace of such anomalies although clear evidence of Andreev states formation is provided. These findings do not lead to an observable ${J}_{2}$. This result combined with extensive numerical simulations put an upper bound on the ZES-induced ${J}_{2}$ of about 0.1% from the first harmonic in the Josephson current for tunneling into the [010] direction and of about 2% for tunneling close to the [110] direction. Our results suggest strong ${J}_{2}$ suppression by diffusive scattering, which is possibly due to nanoscale interface roughness. This is important for proposed (quantum)-electronic device concepts based on the expectance of ${J}_{2}$." @default.
• W2077896778 created "2016-06-24" @default.
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• W2077896778 date "2008-05-16" @default.
• W2077896778 modified "2023-10-17" @default.
• W2077896778 title "Upper bound on the Andreev states induced second harmonic in the Josephson coupling of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>YBa</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub><mml:mo>/</mml:mo><mml:mtext>Nb</mml:…" @default.
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• W2077896778 doi "https://doi.org/10.1103/physrevb.77.184510" @default.
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