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Intermediate scattering potential strength in electron-irradiated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> from London penetration depth measurements
Temperature-dependent London penetration depth, $\ensuremath{\lambda}(T)$, of a high quality optimally doped ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ single crystal was measured using a tunnel-diode resonator. Controlled artificial disorder was induced at a low temperature of 20 K by 2.5 MeV electron irradiation with the accumulation of large doses of $3.8\ifmmode\times\else\texttimes\fi{}{10}^{19}$ and $5.3\ifmmode\times\else\texttimes\fi{}{10}^{19}$ electrons per ${\text{cm}}^{2}$. …