Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 76: Topology: Other Topics

TT 76.6: Talk

Wednesday, March 14, 2018, 18:15–18:30, A 053

Tailoring topological features in the excitation spectra of spin chains via their quantum spin number — •Peter Lemmens^1,2, Dirk Wulferding^1,2, Vladimir Gnezdilov³, Vladimir Kurnosov³, Yurii Pashkevich⁴, A.K. Bera⁵, A.T.M.N. Islam⁵, and Bella Lake⁵ — ¹IPKM, TU-BS, Braunschweig, Germany — ²LENA, TU-BS, Braunschweig, Germany — ³ILTPE, NASU, Kharkov, Ukraine — ⁴DonFTI, NASU, Donetsk, Ukraine — ⁵Helmholtz-Zentrum Berlin, Germany

We provide a comparative insight into the rich spectrum of magnetic excitations in the isostructural spin chain compounds SrCo₂V₂O₈ (s=1/2) and SrNi₂V₂O₈ (s=1). Evidence for fractionalization is obtained for the Haldane chain in an anomalous T-dependence of the scattering intensity and other features.

Work supported by DFG Project LE967/16-1.