Specific Heat of Antimony and Bismuth between 0.03 and 0.8 K

The specific heats of the semimetals antimony and bismuth have been measured from 0.03 to 0.8 K. The best fit to the antimony data yields Cₚ=4.55T^-2+119T+180T³ {μ}J/mole K. The T^-2 term associated with the nuclear quadrupole interaction is in good agreement with NMR measurements and also with theoretical predictions of the electric field gradient at the nucleus. The best fit for bismuth gives Cₚ=0.0064T^-2+8.5T+1120T³ {μ}J/mole K. The value of the coefficient of the electronic specific heat is in agreement with predictions from Fermi-surface parameters. Slow spin-lattice relaxation in bismuth prevents the nuclear quadrupole Schottky anomaly from being observed in a calorimetric measurement.