Nernst Effect and Superconducting Fluctuations in Zn-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$

Abstract

We report the measurements of in-plane resistivity, Hall effect, and Nernst effect in Zn doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ epitaxial thin films grown by pulsed laser deposition technique. The pseudogap temperature, $T^{\ast }$, determined from the temperature dependence of resistivity, does not change significantly with Zn doping. Meanwhile the onset temperature ($T^{\nu }$) 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 $T^{\ast }$, $T^{\nu }$, and $T_{c0}$ versus Zn content is presented and discussed.

arXiv comment6 pages, 5 figures, Latex; v2: to be published in PRB

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• Superconducting Fluctuation and Pseudogap in Disordered Short Coherence Length Superconductor
• Enhancement of superconducting fluctuation under the coexistence of a competing pseudogap state in Bi2Sr2-xRxCuOy
• Correlation between incoherent phase fluctuations and disorder in Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$ epitaxial films from Nernst effect measurements
• Nernst Effect in NdBa_2[Cu_{1-y}Ni_y]_3O_{7-δ}
• Anomalous mesoscopic kinetics in disordered superconductors
• Charge disorder and variations of $T_c$ in Zn-doped cuprate superconductors
• Precursor superconducting diamagnetism in YBa2Cu3O7-d with in-plane or intercalated magnetic impurities
• Universal limiting transition temperature for the high $T_{\mathrm{c}}$ superconductors