Abstract
We performed electron-spin resonance measurements of the β′-(BEDT-TTF) 2ICl 2 in the wide frequency region from 50 to 300 GHz for the first time. The anisotropy and exchange field of the system is obtained by the analysis of the AFMR modes. We will point out the importance of the anisotropic exchange interaction as the origin of the anisotropy.
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