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Spin pseudogap in Ni-doped SrCuO2

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arxiv 1306.2614 v2 pith:DH42P4LU submitted 2013-06-11 cond-mat.str-el

G. Simutis , S. Gvasaliya , M. Mansson , A. L. Chernyshev , A. Mohan , S. Singh , C. Hess , A. T. Savici
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A. I. Kolesnikov A. Piovano T. Perring I. Zaliznyak B. Buchner A. Zheludev
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classification cond-mat.str-el
keywords pseudogapspinsrcuo2absentaccountsallowschainchains
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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 \Delta ~ 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 exprimental data measured in the temperature range 2-300 K, and allows to represent the momentum-integrated dynamic structure factor in a universal scaling form.

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