Specific-Heat Anomaly of the Kagomé-Lattice Ising Model in a Magnetic Field

The properties of the kagomé-lattice Ising model in an external magnetic field B have not been known well. The specific-heat anomaly of the kagomé-lattice Ising model in an external magnetic field is investigated based on the enthalpy fluctuation. As the magnetic field increases, the specific heat maximum decreases, but it approaches non-zero value for large magnetic field. In particular, the asymptotic line to the specific-heat maximum temperature T h ( B ) follows T h ( B ) = 0.8335565596( B + 4). The well-known experimentalist formula T p ( B ) = 0.8335565596 B for paramagnet shows the same slope as the asymptotic line T h ( B ) of the kagomé-lattice Ising model in an external magnetic field.