ESR study of Fe-doped Ca3Co2O6: Isolated spin state of Fe3+ and anomalous D parameter caused by exchange interaction

摘要

Impurity spin resonance of Fe3+ ions doped in the one-dimensional ferromagnet Ca3Co2O6 was investigated in a submillimeter wave region using pulsed magnetic fields at 1.7 K. As expected from the Mossbauer result, the isolated electron state of Fe3+ with g = 2.00 was successfully observed. The D values of Fe ions are found to be 0.66 cm(-1) in a ferrimagnetic region and -0.87 cm(-1) in a ferromagnetic region which is anomalously large and would be caused by the exchange interaction between a Fe spin and surrounding Co spins. [S0163-1829(98)01742-1]. [References: 14]