Survival of the d-wave superconducting state near the edge of antiferromagnetism in the cuprate phase diagram

Details Survival of the d-wave superconducting state near the edge of antiferromagnetism in the cuprate phase diagram Survival of the d-wave superconducting state near the edge of antiferromagnetism in the cuprate phase diagram

2003-12-19

arxiv.org/abs/cond-mat/0312542v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.93.107003

In the cuprate superconductor $YBa_2Cu_3O_{6+x}$, hole doping in the $CuO_2$ layers is controlled by both oxygen content and the degree of oxygen-ordering. At the composition $\rm YBa_2Cu_3O_{6.35}$, the ordering can occur at room temperature, thereby tuning the hole doping so that the superconducting critical temperature gradually rises from zero to 20 K. Here we exploit this to study the c-axis penetration depth as a function of temperature and doping. The temperature dependence shows the d-wave superconductor surviving to very low doping, with no sign of another ordered phase interfering with the nodal quasiparticles. The only apparent doping dependence is a smooth decline of superfluid density as Tc decreases.

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