Abstract
Transport property under pressure and magnetic field is investigated for π-d interaction system (EDTDM) 2 FeBr 4 . At ambient pressure. the π-electrons undergo an SDW transition at T∼15K. The SDW state is suppressed with applying pressure, a metallic state being stabilized above P-9kbar down to liq. He temperature. At P∼9kbar, the resistivity shows an anomaly around Neel temperature of the Fe 3- d-electron spins, suggesting the magnetic ordering effect of the Fe 3+ spins on the π-electrons. A negative magnetoresistance having the largest value at P-9kbar comes from the reduction of the effective periodic potential of Fe 3+ spins stabilizing the SDW state upon the elevation of field.
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