HEAT CAPACITY ANOMALY IN THE CRYSTALLINE ORGANIC FREE RADICAL, p-Cl-BDPA
The heat capacity has been measured on polycrystalline sample of 1,3-bisdiphenylene-2-p-chlorophenyl-allyl (abbreviated as p-Cl-BDPA). The sharp heat capacity anomaly was observed at 3.25 K, which may imply a paramagnetic-antiferromagnetic phase transition. This phenomenon accords well with the other results obtained from the susceptibility, ESR, and NMR measurements.