Millimeter Wave ESR Measurements of (DMET) 2 FeBr 4

Abstract

We have performed millimeter wave ESR measurements of (DMET) 2 FeBr 4 single crystals, which consist of electric quasi 1D chain-based donor layers and magnetic Fe 3+ square lattices, in the temperature region from 1.8 K to 70 K. We observed the splitting of absorption line at 130 GHz, and the estimate the exchange interaction between d -electrons and ~ -electrons. The temperature dependence of ESR at low temperature is discussed in connection with the conventional antiferromagnetic resonance (AFMR). DMET ~ - d system high field ESR