Specific heat and magnetocaloric measurements of the high field FISDW states in (TMTSF)_2ClO_4
Abstract
We have performed simultaneous specific heat and magnetocaloric measurements on a 3.73 mg single crystal of (TMTSF)_2ClO_4, at temperatures between T=2 K and T=6 K in magnetic fields up to H=30 Tesla. Isothermal field sweeps at T=4.18 K show a single normal state to FISDW transition at H=10.5 T, where the the specific heat jumps by ΔC/T=21mJ/moleK^2. No signs of latent heat were observed at this temperature. For T=2.17 K, at the phase transition near H=8 T we find ΔC/T=10mJ/moleK^2. This first order inter-FISDW transition is accompanied by latent heat, which was observed in the magnetocaloric measurement. The very high field transition near H=26 T, T=2.2 K also has a clearly identifiable latent heat signature. No transitions were observed in field sweeps performed at T=6 K. Research supported by DMR 9216165.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.B1208S