Abstract
We report temperature dependent X-Band (f~9.5 GHz) Electron Spin Resonance (ESR) and microwave absorption measurements in a single crystal of TbMnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> . A single Lorentzian ESR line with an isotropic g-value g~1.96 was observed for Tges120 K up to 600 K. The ESR signal is attributed to the Mn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> ions in a insulator environment. The temperature dependence of the ESR linewidth is investigated for the external field applied along the three crystallographic axes. For all direction the ESR linewidth show a strong broadening as the temperature decreases due to the presence of short range magnetic correlations. The microwave absorption around the ferroelectric transition T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">lock</sub> ~27 K was investigated using a special cavity with a TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">103</sub> mode where the sample sits at the maximum microwave electric-field
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