DIFFERENTIAL THERMAL ANALYSIS OF THE FIELD INDUCED PHASE TRANSITIONS OF (TMTSF)2CIO4 ABOVE 1.2 K
Résumé
We present some results of a differential thermal analysis of the magnetic field induced phase transitions in the organic conductor (TMTSF)2C104 above 1.2 K. This study shows that transitions between different spin density wave states are first order and that the total entropy change involved in the two detected transitions (in the temperature range 1.2-2 K) is close to that of the quasi-one-dimensional electron gas. Above 2 and 4.2 K, only a single transition has been detected in our measurements. The entropy of that transition decreases and extrapolates to zero near 5 K. We present some arguments suggesting that if longitudinal nesting (2kF, 0, 0) is to take place in the semi-metalhc SDW phase at high fields it exists only above 2 K or so.
Domaines
| Origine | Accord explicite pour ce dépôt |
|---|---|
| Licence |