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Symmetric and antisymmetric exchange anisotropies in quasi-one-dimensional CuSe2O5 as revealed by ESR

We present an electron spin resonance (ESR) study of single-crystalline spin chain-system CuSe2O5 in the frequency range between 9 GHz and 450 GHz. In a wide temperature range above the Neel temperature TN = 17 K we observe strong and anisotropic frequency dependence of a resonance linewidth. Although sizeable interchain interaction JIC = 0.01 J (J is the intrachain interaction) is present in this system, the ESR results agree well with the Oshikawa-Affleck theory for one-dimensional S = 1/2 Heisenberg antiferromagnet. This theory is used to extract the anisotropies present in CuSe2O5. We find that the symmetric anisotropic exchange Jc = (0.04 +/- 0.01) J and the antisymmetric Dzyaloshinskii-Moriya (DM) interaction D = (0.05 +/- 0.01) J are very similar in size in this system. Staggered-field susceptibility induced by the presence of the DM interaction is witnessed in the macroscopic susceptibility anisotropy.

1D spin systems; EPR; magnetic anisotropy

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