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Electronic charges introduced in copper-oxide planes generate high-transitiontemperature superconductivity but, under special circumstances, they can alsoorder into filaments called stripes. Whether an underlying tendency of chargesto order is present in all cuprates and whether this has any relationship withsuperconductivity are, however, two highly controversial issues. In order touncover underlying electronic orders, magnetic fields strong enough todestabilise superconductivity can be used. Such experiments, including quantumoscillations in YBa2Cu3Oy (a notoriously clean cuprate where charge order isnot observed) have suggested that superconductivity competes with spin, ratherthan charge, order. Here, using nuclear magnetic resonance, we demonstrate thathigh magnetic fields actually induce charge order, without spin order, in theCuO2 planes of YBa2Cu3Oy. The observed static, unidirectional, modulation ofthe charge density breaks translational symmetry, thus explaining quantumoscillation results, and we argue that it is most likely the same 4a-periodicmodulation as in stripe-ordered cuprates. The discovery that it develops onlywhen superconductivity fades away and near the same 1/8th hole doping as inLa2-xBaxCuO4 suggests that charge order, although visibly pinned by CuO chainsin YBa2Cu3Oy, is an intrinsic propensity of the superconducting planes of highTc cuprates.

Magnetic-field-induced charge-stripe order in the high temperature superconductor YBa2Cu3Oy