Electric and magnetic properties for the third phase of (BEDT-TTF)(TCNQ) are investigated. The resistivity exhibits strange hysteresis in a wide range of temperature, with anomalies at 20 K, 80 K, and 175 K. The resistivity under pressure implies that the anomaly at 80 K originates from a kind of phase separation. The anomalies disappear when only 5% of F1-TCNQ is doped. The magnetic susceptibility measured by SQUID showed apparent change at 20 K and 175 K, but no significant change was observed at 80 K. The spin susceptibility measured by ESR, on the other hand, exhibited gradual increase at the temperature from 80 K down to 20 K. © 2003 Elsevier Science B.V. All rights reserved.
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