- Journal Article
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. © 2013 American Physical Society. Show more
Journal / seriesPhysical Review Letters
Pages / Article No.
PublisherAmerican Physical Society
Organisational unit03855 - Zheludev, Andrey / Zheludev, Andrey
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