Nernst effect and superconducting fluctuations in Zn-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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>

TL;DRAbstract

We report the measurements of in-plane resistivity, Hall effect, and Nernst effect in Zn-doped ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ epitaxial thin films grown by pulsed laser deposition technique. The pseudogap temperature ${T}^{*}$, determined from the temperature dependence of resistivity, does not change significantly with Zn doping. Meanwhile the onset temperature $({T}^{\ensuremath{\nu}})$ of anomalous Nernst signal above ${T}_{c0}$, which is interpreted as evidence for vortex-like excitations, decreases sharply as the superconducting transition temperature ${T}_{c0}$ does. A significant decrease in the maximum of vortex Nernst signal in mixed state is also observed, which is consistent with the scenario that Zn impurities cause a decrease in the superfluid density and therefore suppress the superconductivity. The phase diagram of ${T}^{*}$, ${T}^{\ensuremath{\nu}}$, and ${T}_{c0}$ versus Zn content is presented and discussed.

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