Faculté des sciences

Incommensurate magnetic order and dynamics induced by spinless impurities in YBa₂Cu₃O6.6

Suchaneck, A. ; Hinkov, V. ; Haug, D. ; Schulz, Leander ; Bernhard, Christian ; Ivanov, A. ; Hradil, K. ; Lin, C. T. ; Bourges, P. ; Keimer, B. ; Sidis, Y.

In: Physical Review Letters, 2010, vol. 105, p. 037207

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... Plus

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    Summary
    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.