Abstract
The title compound (BEDT-TTF)Zn(SCN) 3 is the first example of a spin-ladder with a frustrating antiferromagnetic interaction. The results of the ESR and the static magnetic susceptibility measurements are reported and discussed based on an extended-Hückel calculation. The temperature dependence of the spin susceptibility is in good agreement with the combination of about 1% of Curie component and a spin-ladder model with a spin-gap of 340 K. The existence of the spin-gap is experimentally confirmed for the first time for a spin-ladder in the weak-coupling limit. Possible effect of the frustration due to the diagonal interaction is also discussed.
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