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Spin pseudogap in Ni-doped SrCuO2.

  • Author(s): Simutis, G
  • Gvasaliya, S
  • Månsson, M
  • Chernyshev, AL
  • Mohan, A
  • Singh, S
  • Hess, C
  • Savici, AT
  • Kolesnikov, AI
  • Piovano, A
  • Perring, T
  • Zaliznyak, I
  • Büchner, B
  • Zheludev, A
  • et al.

The S=1/2 spin chain material SrCuO2 doped with 1% S=1 Ni impurities is studied by inelastic neutron scattering. At low temperatures, the spectrum shows a pseudogap Δ≈8  meV, absent in the parent compound, and not related to any structural phase transition. The pseudogap is shown to be a generic feature of quantum spin chains with dilute defects. A simple model based on this idea quantitatively accounts for the experimental data measured in the temperature range from 2 to 300 K, and allows us to represent the momentum-integrated dynamic structure factor in a universal scaling form.

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