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TT: Fachverband Tiefe Temperaturen

TT 72: Correlated Electrons: Frustrated Magnets - General 2

TT 72.3: Vortrag

Donnerstag, 23. März 2017, 15:30–15:45, HSZ 204

ESR Spectroscopy on the Coupled Spin Tetrahedral System Cu₂Te₂O₅Cl₂ — •Julian Zeisner^1,2, Vladislav Kataev¹, Mirta Herak³, Dijana Zilic⁴, Helmuth Berger⁵, and Bernd Büchner^1,2 — ¹Leibniz Institute for Solid State and Materials Research IFW Dresden, Germany — ²Institute for Solid State Physics, TU Dresden, Germany — ³Institute of Physics, Zagreb, Croatia — ⁴Rudjer Boskovic Institute, Zagreb, Croatia — ⁵Institut de Physique de la Matière Complexe, EPFL, Lausanne, Switzerland

Systems with reduced dimensionality and magnetic frustration gained considerable attention in modern solid state research as both phenomena individually lead to an enhancement of the impact of fluctuations on magnetic properties and low-energy excitations. The coupled spin tetrahedral compound Cu₂Te₂O₅Cl₂ belongs to a class of materials which allow to study the interplay of both effects. In our work we performed a high-field high-frequency ESR study in order to investigate the magnetic anisotropies present in this system as well as the spin dynamics of the compound. Measurements were conducted over a wide frequency and temperature range revealing a small g-factor anisotropy at room temperature which is consistent with torque magnetometry results. Furthermore, the temperature dependence of the linewidth indicates the onset of slowing down of spin fluctuations far above the ordering temperature.