We have searched for dynamic thermal effects in (TMTSF)2PF6 by measuring its specific heat with ac calorimetry. Near its spin-density-wave transition (Tc=12 K), the magnitude of the specific heat is the same as that measured in quasi-static measurements, indicating that there are no kinetic contributions to the specific heat at these temperatures. The anomaly at Tc is consistent with the Ehrenfest relation estimate for a continuous phase transition. No anomalies are observed in a pellet of (TMTSF)2PF6 mixed with KBr at Tc or the expected "spin-density-wave glass" transition (Tg∼3.5 K), suggesting that residual disorder in the pellet freezes in a glassy state at Tc.
|Number of pages||4|
|Journal||Solid State Communications|
|State||Published - Aug 29 2001|
Bibliographical noteFunding Information:
We appreciate the assistance of S. Rimmer in X-ray diffraction and helpful discussions with K. Biljakovic and J. Brooks. This research was supported in part by the National Science Foundation, Grants DMR-9731257, DMR-9414268, and DMR-9300507.
- A. organic crystals
- B. heat capacity
- B. phase transitions
ASJC Scopus subject areas
- Chemistry (all)
- Condensed Matter Physics
- Materials Chemistry