High Field ESR Study of the pi-d Correlated Organic Conductor lambda-(BETS)2Fe0.6Ga0.4Cl4
Y. Oshima, E. Jobiliong, T. Tokumoto, J. S. Brooks, S. A. Zvyagin, J. Krzystek, H. Tanaka, A. Kobayashi, H. Cui, H. Kobayashi
Abstract
Submillimeter and millimeter wave electron spin resonance (ESR) measurements of the pi-d correlated organic conductor lambda-(BETS)2Fe0.6Ga0.4Cl4 have been performed. Antiferromagnetic resonance (AFMR) has been observed in the insulating antiferromagnetic phase, and its frequency-field dependence can be reproduced by the biaxial anisotropic AFMR theory. We find that in this alloy system, the easy-axis is near the b-axis, unlike previous results for the pure lambda-(BETS)2FeCl4 salts where it is closer to the c*-axis. We have also observed electron paramagnetic resonance (EPR) in the metallic phase at higher fields where the g-value is shown to be temperature and frequency dependent for field applied along the c*-axis. This behavior indicates the existence of strong pi-d interaction. Our measurements further show the magnetic anisotropy associated with the anions (the D term in the spin Hamiltonian) is |D|~0.11 cm-1.
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