[Zurück]

A. Suchaneck, V. Hinkov, D. Haug, L. Schulz, C. Bernhard, A. Ivanov, K. Hradil, C. Lin, P. Bourges, B. Keimer, Y. Sidis:
"Incommensurate magnetic order and dynamics induced by spinless impurities in YBa2Cu3O6.6";
Physical Review Letters, 105 (2010), 3; S. 037207-1 - 037207-4.

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 YBa2Cu3O6.6, 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 La2-xSrxCuO4 suggests that this behavior is universal for the layered copper oxides and analogous to impurity-induced magnetic order in one-dimensional quantum magnets.

75.10.Kt, 74.25.Dw, 74.72.Gh, 74.72.Kf

http://dx.doi.org/10.1103/PhysRevLett.105.037207