High-field ESR systems in Kobe
Review articleOpen access

AbstractRecent developments of the high-field facility in Kobe University are presented. A far infrared radiation (FIR) laser system, which can generate electromagnetic waves from 500GHz to 3THz has been installed. Now the frequency region for high-field ESR is extended from 30GHz to 3THz using Gunn oscillators, BWOs and a FIR laser. Recent high-field ESR results of quantum spin systems CsFeBr3 and Cu3(CO3)2(OH)2 using these light sources are presented. CsFeBr3 is known as a field-induced antiferromagnetic ordering substance, and we found new ESR modes in the high-field phase of CsFeBr3 for B//c at 2.0K. Cu3(CO3)2(OH)2 is the model substance for the S=12 quantum diamond chain, and we observed the direct transition in the ESR measurement at 1.9K for B//c.

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