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Charge-density-wave (CDW) correlations within the quintessential CuO$_2$planes have been argued to either cause [1] or compete with [2] thesuperconductivity in the cuprates, and they might furthermore drive theFermi-surface reconstruction in high magnetic fields implied by quantumoscillation (QO) experiments for YBa$_2$Cu$_3$O$_{6+{\delta}}$ (YBCO) [3] andHgBa$_2$CuO$_{4+{\delta}}$ (Hg1201) [4]. Consequently, the observation of bulkCDW order in YBCO was a significant development [5,6,7]. Hg1201 featuresparticularly high structural symmetry and recently has been demonstrated toexhibit Fermi-liquid charge transport in the relevant temperature-doping rangeof the phase diagram, whereas for YBCO and other cuprates this underlyingproperty of the CuO$_2$ planes is partially or fully masked [8-10]. Ittherefore is imperative to establish if the pristine transport behavior ofHg1201 is compatible with CDW order. Here we investigate Hg1201 ($T_c$ = 72 K)via bulk Cu L-edge resonant X-ray scattering. We indeed observe CDWcorrelations in the absence of a magnetic field, although the correlations andcompetition with superconductivity are weaker than in YBCO. Interestingly, atthe measured hole-doping level, both the short-range CDW and Fermi-liquidtransport appear below the same temperature of about 200 K. Our result pointsto a unifying picture in which the CDW formation is preceded at the higherpseudogap temperature by $q$ = 0 magnetic order [11,12] and the build-up ofsignificant dynamic antiferromagnetic correlations [13]. Furthermore, thesmaller CDW modulation wave vector observed for Hg1201 is consistent with thelarger electron pocket implied by both QO [4] and Hall-effect [14]measurements, which suggests that CDW correlations are indeed responsible forthe low-temperature QO phenomenon.

Connection between charge-density-wave order and charge transport in the cuprate superconductors