Magneto-optical probe of antiferromagnetic sub-phases in a pi- d   electronic system
  The highly insulating antiferromagnetic phase of the magnetic- organic conductor lambda-(BETS)2FeCl4 has been probed by resonant mm wave methods vs. magnetic field, temperature, and frequency. Our results show evidence for magnetic sub-phases within the temperature-field phase diagram as previously predicted by Brossard et al. [Eur. Phys. J. B 1, 439(1998)]. 
I. Rutel, S. Okubo, H. Ohta, H. Tanaka, H. Kobayashi, J. Brooks