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TT: Fachverband Tiefe Temperaturen

TT 11: CE: Low-dimensional Systems - Materials 2

TT 11.8: Vortrag

Dienstag, 23. März 2010, 11:30–11:45, H18

Longitundinal magnon in the AF chain system KCuF₃ — Vladimir Gnezdilov¹, •Peter Lemmens², Dirk Wulferding², Paolo Ghigna³, and Joachim Deisenhofer⁴ — ¹ILTP, Kharkov, Ukraine — ²IPKM, TU-BS, Braunschweig — ³DCF, Univ. Pavia, Italy — ⁴Exp. Phys. V, CECM, Univ. Augsburg

The low energy longitudinal magnon in KCuF₃ was observed and studied for the first time in Raman scattering at temperatures below the Neel temperature. The observation of a spinon continuum and this longitudinal mode reveals the coexistence of antiferromagnetic ordering and quantum fluctuations in KCuF₃ for T<T_N. Work supported by DFG.