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The normal state of optimally doped cuprates is dominated by the "strangemetal" phase that shows a linear temperature ($T$) dependence of theresistivity persisting down to the lowest $T$. For underdoped cuprates thisbehavior is lost below the pseudogap temperature $T^*$, where Charge DensityWaves (CDW) together with other intertwined local orders characterize theground state. Here we show that the $T$-linear resistivity of highly strained,ultrathin and underdoped YBa$_2$Cu$_3$O$_{7-\delta}$ films is restored when theCDW amplitude, detected by Resonant Inelastic X-ray scattering, is suppressed.This observation points towards an intimate connection between the onset of CDWand the departure from $T$-linear resistivity in underdoped cuprates. Ourresults illustrate the potential of using strain control to manipulate theground state of quantum materials.

Restored strange metal phase through suppression of charge density waves in underdoped YBa$_2$Cu$_3$O$_{7-\delta}$