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Symmetric and antisymmetric exchange anisotropies in quasi-one-dimensional CuSe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>5</mml:mn></mml:msub></mml:math>as revealed by ESR
We present an electron spin resonance (ESR) study of a single-crystalline spin chain system CuSe${}_{2}$O${}_{5}$ in the frequency range between 9 and 430 GHz. In a wide temperature range above the N\'eel temperature ${T}_{N}=17$ K we observe a strong and anisotropic frequency dependence of a resonance linewidth. Although a sizable …