The effect of pressure on anion ordering in (TMTSF)2BF4
Résumé
We have measured, via electrical transport measurements, the effect of pressure on the anion ordering (AO) transition in (TMTSF)2BF4. The effect of low pressures (<3.5 kbar) is to lower the metal-insulator (MI) transition temperature associated with the AO of the BF4- anions. In the intermediate pressure range (4-7 kbar) the resistivity exhibits anomalous behaviour, peaking at 20 K, the detailed behaviour depending on both the pressure and thermal treatment. In the same pressure/temperature range, the thermoelectric power remains metallic, indicating that the resistive anomalies result from a change in the carrier mobility. Above 7 kbar, the resistivity is metallic down to low temperatures, and incomplete superconductivity is observed in several samples.
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