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Spin-stripe density varies linearly with hole content in single-layer Bi2201 cuprate

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arxiv 1205.3301 v2 pith:DSJS2LHP submitted 2012-05-15 cond-mat.str-el

classification cond-mat.str-el
keywords bi2201single-layercupratedopingholespinbelowboundary
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We have performed inelastic neutron scattering measurements on the single-layer cuprate Bi2+xSr2-xCuO6+y (Bi2201) with x=0.2, 0.3, 0.4 and 0.5, a doping range that spans the spin-glass (SG) to superconducting (SC) phase boundary. The doping evolution of low energy spin fluctuations was found to be characterized by a change of incommensurate modulation wave vector from the tetragonal [110] to [100]/[010] directions, while maintaining a linear relation between the incommensurability and the hole concentration, delta p. In the SC regime, the spectral weight is strongly suppressed below 4 meV. Similarities and differences in the spin correlations between Bi2201 and the prototypical single-layer system La2-xSrxCuO4 are discussed.

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