Both Zn doping and $c$-axis magnetic fields have been observed to increase the spin stripe order in ${\mathrm{La}}_{2\text{−}x}{\mathrm{Ba}}_x{\mathrm{CuO}}_4$ with $x$ close to 1/8. For $x=0.095$, the applied magnetic field also causes superconducting layers to decouple, presumably by favoring pair-density-wave order that consequently frustrates interlayer Josephson coupling. Here we show that introducing 1% Zn also leads to an initial onset of two-dimensional (2D) superconductivity, followed by 3D superconductivity at lower temperatures, even in zero field. We infer that the Zn pins pair-density-wave order locally, establishing the generality of such behavior.

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• Electrical conductivity
• Impurities in superconductors
• Magnetic susceptibility
• Stripes
• Superconducting phase transition
• Cuprates
• High-temperature superconductors
• Resistivity measurements