1205.3301 (M. Enoki et al.)

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

M. Enoki, M. Fujita, S. Iikubo, J. M. Tranquada, D. Singh, S. Chang, K. Yamada

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}\approxp. 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.

View original: http://arxiv.org/abs/1205.3301