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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Correlated Electrons: Other Materials

TT 31.6: Talk

Tuesday, March 21, 2017, 15:15–15:30, HSZ 103

Electron spin resonance of the spin chain compound Cu(py)2Br2: An experimental and theoretical studyJulian Zeisner1, Stephan Zimmermann1, Vladislav Kataev1, •Michael Brockmann2, Frank Göhmann2, Andreas Klümper2, and Alexander Weiße31Leibnitz Insitute for Solid State and Material Research, Dresden, Germany — 2University of Wuppertal, Germany — 3Max Planck Institute for Mathematics, Bonn, Germany

We analyze electron spin resonance (ESR) data of the quasi-one-dimensional magnet Cu(py)2Br2 and compare with theoretical predictions for the spin-1/2 Heisenberg chain with small anisotropic perturbations.

Based on measurements of the angular dependence of resonance shift and linewidth at high temperatures the full g-tensor can be determined and the existence of two anisotropy axes oriented perpendicular to the chain axes is proposed. We further estimate the strength of the anisotropy from several ESR data, in particular from the frequency dependence of the resonance shift at low temperatures, showing that usual field theoretical approaches at zero temperature are not sufficient to explain our low-temperature data. Furthermore, from the angular dependence of the linewidth, the algebraic decay of dynamical correlation functions of the isotropic spin chain can be deduced (∼ t−2/3). This result does not agree with the picture of spin diffusion in one dimension (∼ t−1/2).

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