Low Temperature Specific Heat of Superconducting MgB_(2)

The specific heat of the recently discovered superconductor MgB_(2) has been measured at temperatures ranging from 4.5 to 80 K.Superconducting anomalyΔC at Tc is clearly observed.The total specific heat in normal state can be well fitted by electronic and phonon contributions.The Debye temperatureθD is obtained to be 737 K,much larger than other intermetallic superconductors.Normal state electronic specific heat coefficientγis found to be 2.48±0.5 mJ/mol.K^(2) andΔC/γTc is between 1.41 and 2.15.