Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: Frustrated Magnets - Cu-based Systems & FeCr

TT 42.1: Talk

Wednesday, March 9, 2016, 09:30–09:45, H18

Interplay of Spin and Lattice in a Pseudo-Kagome System — Vladimir Gnezdilov^1,2, •Peter Lemmens², Yurii Pashkevich³, Alexander Vasiliev⁴, and Peter Berdonosov⁴ — ¹ILTPE, Kharkov, Ukraine — ²IPKM, TU-BS, Braunschweig — ³DonFTI, Donetsk, Ukraine — ⁴MSU, Moskow, Russia

The layered cuprates, francisites Cu₃Bi(SeO₃)₂O₂X, with X=Br or Cl, with pseudo-kagome structure were studied across the structural and magnetic phase transitions using Raman spectroscopy. For X=Cl a soft optical mode is revealed. The temperature-dependent changes in the phononic and magnetic subsystems of these highly frustrated magnets allow proposing a microscopic magnetic model including Dzyaloshinsky-Moriya interaction to explain the nature of the observed spin-wave excitations.

Work supported by RTG-DFG 1952/1, Metrology for Complex Nanosystems and the Laboratory for Emerging Nanometrology, TU Braunschweig.