Doiron-Leyraud, Nicolas Onset of a Boson mode at the superconducting critical point of underdoped YBa2Cu3Oy. [electronic resource] - Physical review letters Nov 2006 - 207001 p. digital Publication Type: Journal Article ISSN: 0031-9007 Standard No.: 10.1103/PhysRevLett.97.207001 doi