Temperature and Frequency Dependences of ESR in EuB₆ Single Crystal and EuB₆ Bulk Poly-Crystal

Abstract

Electron spin resonance (ESR) in antiferromagnetic EuB₆ single crystal was observed and compared with the results of ESR in EuB₆ ferromagnetic bulk poly-crystals. No anisotropy was observed in EuB₆ single crystal in all temperatures and all frequency bands in this experiment. Resonance points in single crystal move rapidly to lower fields as temperature is lowered. The shifts of the resonance field should be interpreted by a dynamical anisotropy field. Resonance line width increases with decreasing temperature especially for the cases of single crystal and lower frequencies.