Abstract
Recent developments of the high-field facility in Kobe University are presented. A far infrared radiation (FIR) laser system, which can generate electromagnetic waves from 500 GHz to 3 THz has been installed. Now the frequency region for high-field ESR is extended from 30 GHz to 3 THz using Gunn oscillators, BWOs and a FIR laser. Recent high-field ESR results of quantum spin systems CsFeBr 3 and Cu 3(CO 3) 2(OH) 2 using these light sources are presented. CsFeBr 3 is known as a field-induced antiferromagnetic ordering substance, and we found new ESR modes in the high-field phase of CsFeBr 3 for B// c at 2.0 K . Cu 3(CO 3) 2(OH) 2 is the model substance for the S= 1 2 quantum diamond chain, and we observed the direct transition in the ESR measurement at 1.9 K for B// c.
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