Low Temperature Specific Heat of MnP; Experiment and Analysis

Specific heat in ferromagnetic phase, screw phase and fan phase of MnP have been measured from 1.5 K to 8.0 K. In the ferromagnetic phase, electronic and phonon specific heat are separated from the magnon specific heat estimated from the previous experiment. The following values are obtained. γ ferro =9.65 ±0.5 mj/mole ·deg 2 and θ D =570 -70 +210 K. The large value of γ ferro suggests that the d -electrons exist at the Fermi level and form bands. In the screw and the fan phases, the γ values are evaluated to be, γ screw =5.4 ∼7.6 mj/mole ·deg 2 and γ fan =6.9 ∼9.1 mj/mole ·deg 2 , decreasing by 20 ∼30% from γ ferro . This is consistent with the nesting model proposed before.