Superconductivity-Insensitive Order at q ̃1 /4 in Electron-Doped Cuprates

Charge-density waves (CDWs) in the normal state of cuprates could shed light on the physics of their high-temperature superconductivity. New experiments, however, show no evidence for such waves in an electron-doped cuprate, which means the universality of CDWs in cuprates has yet to be confirmed.