Structureless Anomaly in the TMTTF2X Family

Abstract
A new type of high temperature anomaly, seen as an abrupt change in slope of thermopower and conductivity in the temperature range 100-200 K, is observed in several (TMTTF)2X salts. This anomaly is different from anion ordering phase transitions in several respects: at the anomaly no structural change has been found and the anomaly decreases much more rapidly with pressure. We suggest these anomalies may reflect some sort of electron localisation process.

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