Spin-Stripe Density Varies Linearly With the Hole Content in Single-Layer Bi2+xSr2−xCuO6+y Cuprate Superconductors
M. Enoki, M. Fujita, T. Nishizaki, S. Iikubo, D. K. Singh, S. Chang, J. M. Tranquada, K. Yamada
DOI 10.1103/PhysRevLett.110.017004 · Physical Review Letters
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Abstract
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 to superconducting phase boundary. The doping evolution of low energy spin fluctuations (≲11 meV) was found to be characterized by a change in the incommensurate modulation wave vector from the tetragonal [110] to [100]/[010] directions, while maintaining a linear relation between the incommensurability and the hole concentration, δ≈p. In the superconducting 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2+xSr2-xCuO6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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