Experimental Evidence that Zn Impurities Pin Pair-Density-Wave Order in La${}_{2-x}$Ba${}_x$CuO${}_4$

Abstract

Both Zn-doping and $c$-axis magnetic fields have been observed to increase the spin stripe order in La${}_{2-x}$Ba${}_x$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.

6 pages, 4 figures; updated version, accepted as Letter in PRB

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• Experimental Progress on the Emergent Infinite-Layer Ni-Based Superconductors
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