Specific Heat Anomaly in bcc Solid 3He

We have studied the origin of the excess specific heat (anomaly) above 10 mK in bcc solid3He near melting pressure. We applied strong magnetic fields to the sample to see whether the anomaly arises from spin polarons due to vacancies. The specific heat is the same before and after applying magnetic fields of 10-12 T. This result possibly indicates that the anomaly arises from the origin different from vacancies. Next, in order to check whether the anomaly comes from the surface magnetism, we measured the specific heat by coating the surface of sintered silver with three layers and two layers of4He. The results showed that unexpected large heat capacity due to phase separation of solid3He-4He surpassed and smeared the original specific heat anomaly. We are investigating the origin of the anomaly further.