Abstract
Millimeter and submillimeter wave ESR measurements of Nd 2BaNiO 5 have been carried out at 1.8 K using a single crystal that was obtained by the floating-zone method. The measured frequency region is from 50 GHz to 1.2 THz. The measured magnetic field is up to 30 T. Several AFMR modes due to the 16-sublattice magnetic structure below T N are clearly observed. Changes of AFMR modes at B c1=9.6 T and B c2=16.2 T are observed. AFMR modes with an antiferromagnetic gap of about 240 GHz and 1 THz are observed.
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