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The effect of hydrostatic pressure (P) on charge density waves (CDW) inYBa2Cu3Oy has recently been controversial. Using NMR, we find that both theshort-range CDW in the normal state and the long-range CDW in high fields are,at most, slightly weakened at P=1.9 GPa. This result is in contradiction withx-ray scattering results finding complete suppression of the CDW at ~1 GPa andwe discuss possible explanations of this discrepancy. Quantitative analysis,however, shows that the NMR data is not inconsistent with a disappearance ofthe CDW on a larger pressure scale, typically ~10-20 GPa. We also propose asimple model reconciling transport data with such a hypothesis, provided thepressure-induced change in doping is taken into account. We conclude that it istherefore possible that most of the spectacular increase in Tc upon increasingpressure up to ~15~GPa arises from a concomitant decrease of CDW strength.

NMR study of charge density waves under hydrostatic pressure in YBa2Cu3Oy