Details

Autor(en) / Beteiligte

• Simutis, G
• Gvasaliya, S
• Månsson, M
• Chernyshev, A L
• Mohan, A
• Singh, S
• Hess, C
• Savici, A T
• Kolesnikov, A I
• Piovano, A
• Perring, T
• Zaliznyak, I
• Büchner, B
• Zheludev, A

Titel

Spin pseudogap in Ni-doped SrCuO2

Ist Teil von

• Physical review letters, 2013-08, Vol.111 (6), p.067204-067204

Ort / Verlag

United States

Erscheinungsjahr

2013

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• 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.