Thank you very much for your reply, M. Quack.
This sample is a molecular magnet {V15}. The difficulty of this sample is the specific-heat contribution from lattice is difficult to be subtracted since I got no nonmagnetic reference. Therefore the magnetic specific heat cannot be obtained...
I measured the heat capacity of a sample under various magnetic fields. When I calculated the magnetic entropy as a function of temperature, I found the magnetic entropy measured at 0.5 Tesla is higher than that measured at 0 T. As far as I know, the magnetic field will try to allign the...