title: Incommensurate magnetic order and dynamics induced by spinless impurities in YBa(2)Cu(3)O(6.6).
abstract: We report an inelastic-neutron-scattering and muon-spin-relaxation study of the effect of 2% spinless (Zn) impurities on the magnetic order and dynamics of YBa(2)Cu(3)O(6.6), an underdoped high-temperature superconductor that exhibits a prominent spin pseudogap in its normal state. Zn substitution induces static magnetic order at low temperatures and triggers a large-scale spectral-weight redistribution from the magnetic resonant mode at 38 meV into uniaxial, incommensurate spin excitations with energies well below the spin pseudogap. These observations indicate a competition between incommensurate magnetic order and superconductivity close to a quantum critical point. Comparison to prior data on La(2-x)Sr(x)CuO(4) suggests that this behavior is universal for the layered copper oxides and analogous to impurity-induced magnetic order in one-dimensional quantum magnets.
authors.affiliation: Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Suchaneck
authors.forename: V
authors.initials: V
authors.lastname: Hinkov
authors.forename: D
authors.initials: D
authors.lastname: Haug
authors.forename: L
authors.initials: L
authors.lastname: Schulz
authors.forename: C
authors.initials: C
authors.lastname: Bernhard
authors.forename: A
authors.initials: A
authors.lastname: Ivanov
authors.forename: K
authors.initials: K
authors.lastname: Hradil
authors.forename: C T
authors.initials: CT
authors.lastname: Lin
authors.forename: P
authors.initials: P
authors.lastname: Bourges
authors.forename: B
authors.initials: B
authors.lastname: Keimer
authors.forename: Y
authors.initials: Y
authors.lastname: Sidis