The specific heat of BaVS3, which undergoes a metal-insulator transition at TMI = 70 K, was measured in the temperature range of 1.4 K to 300 K. A specific heat anomaly was found at TMI. The entropy change associated with this anomaly is estimated to be 4.7 J/K mol, which is close to R ln.2. the expected magnetic entropy for S = 1/2 spins of V atoms. At low temperatures, a T-linear contribution of the specific heat with an apparent γ value of 15.7 mJ/K2 mol was observed in spite of the absence of conduction electrons. This T-linear contribution may be attributed to spin wave excitations for a one-dimensional antiferromagnet.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)